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24 | <o:LastAuthor>Von Dreele</o:LastAuthor> |
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331 | <w:LsdException Locked="false" Priority="19" SemiHidden="false" |
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332 | UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/> |
---|
333 | <w:LsdException Locked="false" Priority="21" SemiHidden="false" |
---|
334 | UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/> |
---|
335 | <w:LsdException Locked="false" Priority="31" SemiHidden="false" |
---|
336 | UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/> |
---|
337 | <w:LsdException Locked="false" Priority="32" SemiHidden="false" |
---|
338 | UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/> |
---|
339 | <w:LsdException Locked="false" Priority="33" SemiHidden="false" |
---|
340 | UnhideWhenUsed="false" QFormat="true" Name="Book Title"/> |
---|
341 | <w:LsdException Locked="false" Priority="37" Name="Bibliography"/> |
---|
342 | <w:LsdException Locked="false" Priority="39" QFormat="true" Name="TOC Heading"/> |
---|
343 | </w:LatentStyles> |
---|
344 | </xml><![endif]--> |
---|
345 | <style> |
---|
346 | <!-- |
---|
347 | /* Font Definitions */ |
---|
348 | @font-face |
---|
349 | {font-family:Courier; |
---|
350 | panose-1:2 7 4 9 2 2 5 2 4 4; |
---|
351 | mso-font-alt:"Courier New"; |
---|
352 | mso-font-charset:0; |
---|
353 | mso-generic-font-family:modern; |
---|
354 | mso-font-format:other; |
---|
355 | mso-font-pitch:fixed; |
---|
356 | mso-font-signature:3 0 0 0 1 0;} |
---|
357 | @font-face |
---|
358 | {font-family:Courier; |
---|
359 | panose-1:2 7 4 9 2 2 5 2 4 4; |
---|
360 | mso-font-alt:"Courier New"; |
---|
361 | mso-font-charset:0; |
---|
362 | mso-generic-font-family:modern; |
---|
363 | mso-font-format:other; |
---|
364 | mso-font-pitch:fixed; |
---|
365 | mso-font-signature:3 0 0 0 1 0;} |
---|
366 | @font-face |
---|
367 | {font-family:Cambria; |
---|
368 | panose-1:2 4 5 3 5 4 6 3 2 4; |
---|
369 | mso-font-charset:0; |
---|
370 | mso-generic-font-family:roman; |
---|
371 | mso-font-pitch:variable; |
---|
372 | mso-font-signature:-536870145 1073743103 0 0 415 0;} |
---|
373 | @font-face |
---|
374 | {font-family:Calibri; |
---|
375 | panose-1:2 15 5 2 2 2 4 3 2 4; |
---|
376 | mso-font-charset:0; |
---|
377 | mso-generic-font-family:swiss; |
---|
378 | mso-font-pitch:variable; |
---|
379 | mso-font-signature:-536870145 1073786111 1 0 415 0;} |
---|
380 | @font-face |
---|
381 | {font-family:"Lucida Grande"; |
---|
382 | mso-font-alt:"Times New Roman"; |
---|
383 | mso-font-charset:0; |
---|
384 | mso-generic-font-family:auto; |
---|
385 | mso-font-pitch:variable; |
---|
386 | mso-font-signature:0 1342218751 0 0 447 0;} |
---|
387 | @font-face |
---|
388 | {font-family:Consolas; |
---|
389 | panose-1:2 11 6 9 2 2 4 3 2 4; |
---|
390 | mso-font-charset:0; |
---|
391 | mso-generic-font-family:modern; |
---|
392 | mso-font-pitch:fixed; |
---|
393 | mso-font-signature:-520092929 1073806591 9 0 415 0;} |
---|
394 | /* Style Definitions */ |
---|
395 | p.MsoNormal, li.MsoNormal, div.MsoNormal |
---|
396 | {mso-style-unhide:no; |
---|
397 | mso-style-qformat:yes; |
---|
398 | mso-style-parent:""; |
---|
399 | margin:0in; |
---|
400 | margin-bottom:.0001pt; |
---|
401 | mso-pagination:widow-orphan; |
---|
402 | font-size:12.0pt; |
---|
403 | mso-bidi-font-size:10.0pt; |
---|
404 | font-family:"Times New Roman","serif"; |
---|
405 | mso-fareast-font-family:"Times New Roman"; |
---|
406 | mso-fareast-theme-font:minor-fareast; |
---|
407 | mso-bidi-font-family:"Times New Roman"; |
---|
408 | mso-bidi-theme-font:minor-bidi; |
---|
409 | mso-fareast-language:JA;} |
---|
410 | h1 |
---|
411 | {mso-style-priority:9; |
---|
412 | mso-style-unhide:no; |
---|
413 | mso-style-qformat:yes; |
---|
414 | mso-style-link:"Heading 1 Char"; |
---|
415 | mso-style-next:Normal; |
---|
416 | margin-top:24.0pt; |
---|
417 | margin-right:0in; |
---|
418 | margin-bottom:0in; |
---|
419 | margin-left:0in; |
---|
420 | margin-bottom:.0001pt; |
---|
421 | mso-pagination:widow-orphan lines-together; |
---|
422 | page-break-after:avoid; |
---|
423 | mso-outline-level:1; |
---|
424 | font-size:18.0pt; |
---|
425 | mso-bidi-font-size:16.0pt; |
---|
426 | font-family:"Times New Roman","serif"; |
---|
427 | mso-fareast-font-family:"Times New Roman"; |
---|
428 | mso-fareast-theme-font:major-fareast; |
---|
429 | mso-bidi-font-family:"Times New Roman"; |
---|
430 | mso-bidi-theme-font:major-bidi; |
---|
431 | mso-font-kerning:0pt; |
---|
432 | mso-fareast-language:JA;} |
---|
433 | h2 |
---|
434 | {mso-style-noshow:yes; |
---|
435 | mso-style-priority:9; |
---|
436 | mso-style-qformat:yes; |
---|
437 | mso-style-link:"Heading 2 Char"; |
---|
438 | mso-style-next:Normal; |
---|
439 | margin-top:10.0pt; |
---|
440 | margin-right:0in; |
---|
441 | margin-bottom:0in; |
---|
442 | margin-left:0in; |
---|
443 | margin-bottom:.0001pt; |
---|
444 | mso-pagination:widow-orphan lines-together; |
---|
445 | page-break-after:avoid; |
---|
446 | mso-outline-level:2; |
---|
447 | font-size:13.0pt; |
---|
448 | font-family:"Calibri","sans-serif"; |
---|
449 | mso-ascii-font-family:Calibri; |
---|
450 | mso-ascii-theme-font:major-latin; |
---|
451 | mso-fareast-font-family:"Times New Roman"; |
---|
452 | mso-fareast-theme-font:major-fareast; |
---|
453 | mso-hansi-font-family:Calibri; |
---|
454 | mso-hansi-theme-font:major-latin; |
---|
455 | mso-bidi-font-family:"Times New Roman"; |
---|
456 | mso-bidi-theme-font:major-bidi; |
---|
457 | color:#4F81BD; |
---|
458 | mso-themecolor:accent1; |
---|
459 | mso-fareast-language:JA;} |
---|
460 | a:link, span.MsoHyperlink |
---|
461 | {mso-style-noshow:yes; |
---|
462 | mso-style-priority:99; |
---|
463 | color:blue; |
---|
464 | mso-themecolor:hyperlink; |
---|
465 | text-decoration:underline; |
---|
466 | text-underline:single;} |
---|
467 | a:visited, span.MsoHyperlinkFollowed |
---|
468 | {mso-style-noshow:yes; |
---|
469 | mso-style-priority:99; |
---|
470 | color:purple; |
---|
471 | mso-themecolor:followedhyperlink; |
---|
472 | text-decoration:underline; |
---|
473 | text-underline:single;} |
---|
474 | pre |
---|
475 | {mso-style-noshow:yes; |
---|
476 | mso-style-priority:99; |
---|
477 | mso-style-link:"HTML Preformatted Char"; |
---|
478 | margin:0in; |
---|
479 | margin-bottom:.0001pt; |
---|
480 | mso-pagination:widow-orphan; |
---|
481 | font-size:10.0pt; |
---|
482 | font-family:"Courier New"; |
---|
483 | mso-fareast-font-family:"Times New Roman"; |
---|
484 | mso-fareast-theme-font:minor-fareast;} |
---|
485 | p.MsoAcetate, li.MsoAcetate, div.MsoAcetate |
---|
486 | {mso-style-noshow:yes; |
---|
487 | mso-style-priority:99; |
---|
488 | mso-style-link:"Balloon Text Char"; |
---|
489 | margin:0in; |
---|
490 | margin-bottom:.0001pt; |
---|
491 | mso-pagination:widow-orphan; |
---|
492 | font-size:9.0pt; |
---|
493 | font-family:"Lucida Grande"; |
---|
494 | mso-fareast-font-family:"Times New Roman"; |
---|
495 | mso-fareast-theme-font:minor-fareast; |
---|
496 | mso-fareast-language:JA;} |
---|
497 | p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph |
---|
498 | {mso-style-priority:34; |
---|
499 | mso-style-unhide:no; |
---|
500 | mso-style-qformat:yes; |
---|
501 | margin-top:0in; |
---|
502 | margin-right:0in; |
---|
503 | margin-bottom:0in; |
---|
504 | margin-left:.5in; |
---|
505 | margin-bottom:.0001pt; |
---|
506 | mso-add-space:auto; |
---|
507 | mso-pagination:widow-orphan; |
---|
508 | font-size:12.0pt; |
---|
509 | mso-bidi-font-size:10.0pt; |
---|
510 | font-family:"Times New Roman","serif"; |
---|
511 | mso-fareast-font-family:"Times New Roman"; |
---|
512 | mso-fareast-theme-font:minor-fareast; |
---|
513 | mso-bidi-font-family:"Times New Roman"; |
---|
514 | mso-bidi-theme-font:minor-bidi; |
---|
515 | mso-fareast-language:JA;} |
---|
516 | p.MsoListParagraphCxSpFirst, li.MsoListParagraphCxSpFirst, div.MsoListParagraphCxSpFirst |
---|
517 | {mso-style-priority:34; |
---|
518 | mso-style-unhide:no; |
---|
519 | mso-style-qformat:yes; |
---|
520 | mso-style-type:export-only; |
---|
521 | margin-top:0in; |
---|
522 | margin-right:0in; |
---|
523 | margin-bottom:0in; |
---|
524 | margin-left:.5in; |
---|
525 | margin-bottom:.0001pt; |
---|
526 | mso-add-space:auto; |
---|
527 | mso-pagination:widow-orphan; |
---|
528 | font-size:12.0pt; |
---|
529 | mso-bidi-font-size:10.0pt; |
---|
530 | font-family:"Times New Roman","serif"; |
---|
531 | mso-fareast-font-family:"Times New Roman"; |
---|
532 | mso-fareast-theme-font:minor-fareast; |
---|
533 | mso-bidi-font-family:"Times New Roman"; |
---|
534 | mso-bidi-theme-font:minor-bidi; |
---|
535 | mso-fareast-language:JA;} |
---|
536 | p.MsoListParagraphCxSpMiddle, li.MsoListParagraphCxSpMiddle, div.MsoListParagraphCxSpMiddle |
---|
537 | {mso-style-priority:34; |
---|
538 | mso-style-unhide:no; |
---|
539 | mso-style-qformat:yes; |
---|
540 | mso-style-type:export-only; |
---|
541 | margin-top:0in; |
---|
542 | margin-right:0in; |
---|
543 | margin-bottom:0in; |
---|
544 | margin-left:.5in; |
---|
545 | margin-bottom:.0001pt; |
---|
546 | mso-add-space:auto; |
---|
547 | mso-pagination:widow-orphan; |
---|
548 | font-size:12.0pt; |
---|
549 | mso-bidi-font-size:10.0pt; |
---|
550 | font-family:"Times New Roman","serif"; |
---|
551 | mso-fareast-font-family:"Times New Roman"; |
---|
552 | mso-fareast-theme-font:minor-fareast; |
---|
553 | mso-bidi-font-family:"Times New Roman"; |
---|
554 | mso-bidi-theme-font:minor-bidi; |
---|
555 | mso-fareast-language:JA;} |
---|
556 | p.MsoListParagraphCxSpLast, li.MsoListParagraphCxSpLast, div.MsoListParagraphCxSpLast |
---|
557 | {mso-style-priority:34; |
---|
558 | mso-style-unhide:no; |
---|
559 | mso-style-qformat:yes; |
---|
560 | mso-style-type:export-only; |
---|
561 | margin-top:0in; |
---|
562 | margin-right:0in; |
---|
563 | margin-bottom:0in; |
---|
564 | margin-left:.5in; |
---|
565 | margin-bottom:.0001pt; |
---|
566 | mso-add-space:auto; |
---|
567 | mso-pagination:widow-orphan; |
---|
568 | font-size:12.0pt; |
---|
569 | mso-bidi-font-size:10.0pt; |
---|
570 | font-family:"Times New Roman","serif"; |
---|
571 | mso-fareast-font-family:"Times New Roman"; |
---|
572 | mso-fareast-theme-font:minor-fareast; |
---|
573 | mso-bidi-font-family:"Times New Roman"; |
---|
574 | mso-bidi-theme-font:minor-bidi; |
---|
575 | mso-fareast-language:JA;} |
---|
576 | span.Heading1Char |
---|
577 | {mso-style-name:"Heading 1 Char"; |
---|
578 | mso-style-priority:9; |
---|
579 | mso-style-unhide:no; |
---|
580 | mso-style-locked:yes; |
---|
581 | mso-style-link:"Heading 1"; |
---|
582 | mso-ansi-font-size:18.0pt; |
---|
583 | mso-bidi-font-size:16.0pt; |
---|
584 | font-family:"Times New Roman","serif"; |
---|
585 | mso-ascii-font-family:"Times New Roman"; |
---|
586 | mso-fareast-font-family:"Times New Roman"; |
---|
587 | mso-fareast-theme-font:major-fareast; |
---|
588 | mso-hansi-font-family:"Times New Roman"; |
---|
589 | mso-bidi-font-family:"Times New Roman"; |
---|
590 | mso-bidi-theme-font:major-bidi; |
---|
591 | font-weight:bold;} |
---|
592 | span.Heading2Char |
---|
593 | {mso-style-name:"Heading 2 Char"; |
---|
594 | mso-style-noshow:yes; |
---|
595 | mso-style-priority:9; |
---|
596 | mso-style-unhide:no; |
---|
597 | mso-style-locked:yes; |
---|
598 | mso-style-link:"Heading 2"; |
---|
599 | mso-ansi-font-size:13.0pt; |
---|
600 | mso-bidi-font-size:13.0pt; |
---|
601 | font-family:"Calibri","sans-serif"; |
---|
602 | mso-ascii-font-family:Calibri; |
---|
603 | mso-ascii-theme-font:major-latin; |
---|
604 | mso-fareast-font-family:"Times New Roman"; |
---|
605 | mso-fareast-theme-font:major-fareast; |
---|
606 | mso-hansi-font-family:Calibri; |
---|
607 | mso-hansi-theme-font:major-latin; |
---|
608 | mso-bidi-font-family:"Times New Roman"; |
---|
609 | mso-bidi-theme-font:major-bidi; |
---|
610 | color:#4F81BD; |
---|
611 | mso-themecolor:accent1; |
---|
612 | font-weight:bold;} |
---|
613 | span.HTMLPreformattedChar |
---|
614 | {mso-style-name:"HTML Preformatted Char"; |
---|
615 | mso-style-noshow:yes; |
---|
616 | mso-style-priority:99; |
---|
617 | mso-style-unhide:no; |
---|
618 | mso-style-locked:yes; |
---|
619 | mso-style-link:"HTML Preformatted"; |
---|
620 | font-family:Consolas; |
---|
621 | mso-ascii-font-family:Consolas; |
---|
622 | mso-hansi-font-family:Consolas; |
---|
623 | mso-bidi-font-family:Consolas;} |
---|
624 | span.BalloonTextChar |
---|
625 | {mso-style-name:"Balloon Text Char"; |
---|
626 | mso-style-noshow:yes; |
---|
627 | mso-style-priority:99; |
---|
628 | mso-style-unhide:no; |
---|
629 | mso-style-locked:yes; |
---|
630 | mso-style-link:"Balloon Text"; |
---|
631 | mso-ansi-font-size:9.0pt; |
---|
632 | mso-bidi-font-size:9.0pt; |
---|
633 | font-family:"Lucida Grande"; |
---|
634 | mso-ascii-font-family:"Lucida Grande"; |
---|
635 | mso-hansi-font-family:"Lucida Grande"; |
---|
636 | mso-bidi-font-family:"Lucida Grande";} |
---|
637 | .MsoChpDefault |
---|
638 | {mso-style-type:export-only; |
---|
639 | mso-default-props:yes; |
---|
640 | font-size:10.0pt; |
---|
641 | mso-ansi-font-size:10.0pt; |
---|
642 | mso-bidi-font-size:10.0pt; |
---|
643 | font-family:"Cambria","serif"; |
---|
644 | mso-ascii-font-family:Cambria; |
---|
645 | mso-ascii-theme-font:minor-latin; |
---|
646 | mso-fareast-font-family:"Times New Roman"; |
---|
647 | mso-fareast-theme-font:minor-fareast; |
---|
648 | mso-hansi-font-family:Cambria; |
---|
649 | mso-hansi-theme-font:minor-latin; |
---|
650 | mso-bidi-font-family:"Times New Roman"; |
---|
651 | mso-bidi-theme-font:minor-bidi; |
---|
652 | mso-fareast-language:JA;} |
---|
653 | @page WordSection1 |
---|
654 | {size:8.5in 11.0in; |
---|
655 | margin:1.0in 1.25in 1.0in 1.25in; |
---|
656 | mso-header-margin:.5in; |
---|
657 | mso-footer-margin:.5in; |
---|
658 | mso-paper-source:0;} |
---|
659 | div.WordSection1 |
---|
660 | {page:WordSection1;} |
---|
661 | /* List Definitions */ |
---|
662 | @list l0 |
---|
663 | {mso-list-id:109671306; |
---|
664 | mso-list-type:hybrid; |
---|
665 | mso-list-template-ids:129770836 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;} |
---|
666 | @list l0:level1 |
---|
667 | {mso-level-tab-stop:none; |
---|
668 | mso-level-number-position:left; |
---|
669 | text-indent:-.25in;} |
---|
670 | @list l0:level2 |
---|
671 | {mso-level-number-format:alpha-lower; |
---|
672 | mso-level-tab-stop:none; |
---|
673 | mso-level-number-position:left; |
---|
674 | text-indent:-.25in;} |
---|
675 | @list l0:level3 |
---|
676 | {mso-level-number-format:roman-lower; |
---|
677 | mso-level-tab-stop:none; |
---|
678 | mso-level-number-position:right; |
---|
679 | text-indent:-9.0pt;} |
---|
680 | @list l0:level4 |
---|
681 | {mso-level-tab-stop:none; |
---|
682 | mso-level-number-position:left; |
---|
683 | text-indent:-.25in;} |
---|
684 | @list l0:level5 |
---|
685 | {mso-level-number-format:alpha-lower; |
---|
686 | mso-level-tab-stop:none; |
---|
687 | mso-level-number-position:left; |
---|
688 | text-indent:-.25in;} |
---|
689 | @list l0:level6 |
---|
690 | {mso-level-number-format:roman-lower; |
---|
691 | mso-level-tab-stop:none; |
---|
692 | mso-level-number-position:right; |
---|
693 | text-indent:-9.0pt;} |
---|
694 | @list l0:level7 |
---|
695 | {mso-level-tab-stop:none; |
---|
696 | mso-level-number-position:left; |
---|
697 | text-indent:-.25in;} |
---|
698 | @list l0:level8 |
---|
699 | {mso-level-number-format:alpha-lower; |
---|
700 | mso-level-tab-stop:none; |
---|
701 | mso-level-number-position:left; |
---|
702 | text-indent:-.25in;} |
---|
703 | @list l0:level9 |
---|
704 | {mso-level-number-format:roman-lower; |
---|
705 | mso-level-tab-stop:none; |
---|
706 | mso-level-number-position:right; |
---|
707 | text-indent:-9.0pt;} |
---|
708 | @list l1 |
---|
709 | {mso-list-id:235746779; |
---|
710 | mso-list-type:hybrid; |
---|
711 | mso-list-template-ids:129770836 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;} |
---|
712 | @list l1:level1 |
---|
713 | {mso-level-tab-stop:none; |
---|
714 | mso-level-number-position:left; |
---|
715 | text-indent:-.25in;} |
---|
716 | @list l1:level2 |
---|
717 | {mso-level-number-format:alpha-lower; |
---|
718 | mso-level-tab-stop:none; |
---|
719 | mso-level-number-position:left; |
---|
720 | text-indent:-.25in;} |
---|
721 | @list l1:level3 |
---|
722 | {mso-level-number-format:roman-lower; |
---|
723 | mso-level-tab-stop:none; |
---|
724 | mso-level-number-position:right; |
---|
725 | text-indent:-9.0pt;} |
---|
726 | @list l1:level4 |
---|
727 | {mso-level-tab-stop:none; |
---|
728 | mso-level-number-position:left; |
---|
729 | text-indent:-.25in;} |
---|
730 | @list l1:level5 |
---|
731 | {mso-level-number-format:alpha-lower; |
---|
732 | mso-level-tab-stop:none; |
---|
733 | mso-level-number-position:left; |
---|
734 | text-indent:-.25in;} |
---|
735 | @list l1:level6 |
---|
736 | {mso-level-number-format:roman-lower; |
---|
737 | mso-level-tab-stop:none; |
---|
738 | mso-level-number-position:right; |
---|
739 | text-indent:-9.0pt;} |
---|
740 | @list l1:level7 |
---|
741 | {mso-level-tab-stop:none; |
---|
742 | mso-level-number-position:left; |
---|
743 | text-indent:-.25in;} |
---|
744 | @list l1:level8 |
---|
745 | {mso-level-number-format:alpha-lower; |
---|
746 | mso-level-tab-stop:none; |
---|
747 | mso-level-number-position:left; |
---|
748 | text-indent:-.25in;} |
---|
749 | @list l1:level9 |
---|
750 | {mso-level-number-format:roman-lower; |
---|
751 | mso-level-tab-stop:none; |
---|
752 | mso-level-number-position:right; |
---|
753 | text-indent:-9.0pt;} |
---|
754 | @list l2 |
---|
755 | {mso-list-id:584074573; |
---|
756 | mso-list-type:hybrid; |
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934 | |
---|
935 | <h1>Parametric Fitting and Pseudo Variables for Sequential Fits</h1> |
---|
936 | |
---|
937 | <p class=MsoNormal><o:p> </o:p></p> |
---|
938 | |
---|
939 | <p class=MsoNormal>Once a sequential fit has been performed, any function of |
---|
940 | the fit parameters from the fit and <i style='mso-bidi-font-style:normal'>their |
---|
941 | estimated uncertainty</i> (s.u.) can be computed by defining one or more |
---|
942 | "pseudo-variables". Note that the covariance matrix from the fit is |
---|
943 | used to provide appropriate treatment of the correlation in parameters with |
---|
944 | respect to uncertainty estimation.<span style='mso-spacerun:yes'> </span>In |
---|
945 | addition, parametric equations in terms of sample parameters such as |
---|
946 | temperature and pressure, etc. can be fit to either the parameters from the fit |
---|
947 | or the pseudo-variables. </p> |
---|
948 | |
---|
949 | <p class=MsoNormal><o:p> </o:p></p> |
---|
950 | |
---|
951 | <p class=MsoNormal>This tutorial assumes that the steps in the <span |
---|
952 | style='mso-bidi-font-family:"Times New Roman"'><a href="SequentialTutorial.htm">Sequential |
---|
953 | refinement of multiple datasets</a> tutorial have already been performed. </span>If |
---|
954 | you have not done so already, <a href="Starting%20GSAS.htm">start GSAS-II</a>. |
---|
955 | Some of the pictures in this tutorial are from a Mac OSX machine; these |
---|
956 | illustrate the differences in menu location from Windows/Linux machines.</p> |
---|
957 | |
---|
958 | <h1>Step 1. Open the previous Sequential Fit</h1> |
---|
959 | |
---|
960 | <p class=MsoNormal><o:p> </o:p></p> |
---|
961 | |
---|
962 | <p class=MsoListParagraphCxSpFirst style='margin-bottom:6.0pt;mso-add-space: |
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963 | auto;text-indent:-.25in;mso-list:l4 level1 lfo2'><![if !supportLists]><span |
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964 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
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965 | style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> |
---|
966 | </span></span></span><![endif]>Select the<b style='mso-bidi-font-weight:normal'> |
---|
967 | </b><b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
968 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>File/Open |
---|
969 | Project</span></b> menu item to load file named <b style='mso-bidi-font-weight: |
---|
970 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
971 | major-latin;mso-hansi-theme-font:major-latin'>SeqTut.gpx</span></b>. </p> |
---|
972 | |
---|
973 | <p class=MsoListParagraphCxSpMiddle style='margin-bottom:6.0pt;mso-add-space: |
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974 | auto;text-indent:-.25in;mso-list:l4 level1 lfo2'><![if !supportLists]><span |
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975 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
976 | style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> |
---|
977 | </span></span></span><![endif]>Select the <b style='mso-bidi-font-weight:normal'><span |
---|
978 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
979 | mso-hansi-theme-font:major-latin'>Sequential results</span></b> item in the |
---|
980 | data tree. The sequential refinement results data table is displayed, as below. |
---|
981 | </p> |
---|
982 | |
---|
983 | <p class=MsoListParagraphCxSpLast style='margin-bottom:6.0pt;mso-add-space: |
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999 | <v:f eqn="prod @7 21600 pixelHeight"/> |
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1005 | style='width:525pt;height:262.5pt;visibility:visible;mso-wrap-style:square'> |
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1006 | <v:imagedata src="ParametricFitting_files/image001.png" o:title=""/> |
---|
1007 | </v:shape><![endif]--><![if !vml]><img border=0 width=700 height=350 |
---|
1008 | src="ParametricFitting_files/image001.png" v:shapes="Picture_x0020_36"><![endif]></span></p> |
---|
1009 | |
---|
1010 | <h1>Step 2. Create a Pseudo Variable</h1> |
---|
1011 | |
---|
1012 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1013 | |
---|
1014 | <p class=MsoNormal>Pseudo-variables allow computation of an arbitrarily defined |
---|
1015 | function of combinations of the variables that are displayed in the sequential |
---|
1016 | refinement table. Any valid Python language expression can be used to define |
---|
1017 | this. While one can plot <i style='mso-bidi-font-style:normal'>a</i>, <i |
---|
1018 | style='mso-bidi-font-style:normal'>b</i> and <i style='mso-bidi-font-style: |
---|
1019 | normal'>c</i> axis lengths by clicking on the appropriate column of the table, |
---|
1020 | to compare them one might want to scale them. Alternately, as will be done |
---|
1021 | here, we will plot the ratio of <i style='mso-bidi-font-style:normal'>b</i> and |
---|
1022 | <i style='mso-bidi-font-style:normal'>c</i>.</p> |
---|
1023 | |
---|
1024 | <p class=MsoNormal><o:p> </o:p></p> |
---|
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---|
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---|
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---|
1030 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1031 | major-latin;mso-hansi-theme-font:major-latin'>Pseudo Vars/Add</span></b> menu |
---|
1032 | item to create a new pseudo-variable.</p> |
---|
1033 | |
---|
1034 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1035 | |
---|
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---|
1048 | style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> |
---|
1049 | </span></span></span><![endif]>A window opens to define a formula</p> |
---|
1050 | |
---|
1051 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1052 | |
---|
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---|
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---|
1076 | </v:shape><![endif]--><![if !vml]><img width=306 height=115 |
---|
1077 | src="ParametricFitting_files/image007.jpg" align=right hspace=12 v:shapes="Picture_x0020_4"><![endif]>In |
---|
1078 | this window, type a Python expression<b style='mso-bidi-font-weight:normal'>, </b><span |
---|
1079 | style='mso-bidi-font-family:"Times New Roman"'>"</span><b |
---|
1080 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1081 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin;mso-bidi-font-family: |
---|
1082 | "Times New Roman"'>b/c</span></b><span style='mso-bidi-font-family:"Times New Roman"'>",</span> |
---|
1083 | but note that the variables <b style='mso-bidi-font-weight:normal'><span |
---|
1084 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1085 | mso-hansi-theme-font:major-latin'>c</span></b> and <b style='mso-bidi-font-weight: |
---|
1086 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1087 | major-latin;mso-hansi-theme-font:major-latin'>b</span></b> here are arbitrary |
---|
1088 | labels. After entering the formula, press the <b style='mso-bidi-font-weight: |
---|
1089 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1090 | major-latin;mso-hansi-theme-font:major-latin'>Validate</span></b> button or |
---|
1091 | wait a few seconds and the validation will be tested automatically. Note that if |
---|
1092 | you pause too long, while typing, an error message may be displayed as the |
---|
1093 | incomplete formula is found to be invalid. If so, make corrections or keep |
---|
1094 | typing until the entire expression is entered.<span style='mso-spacerun:yes'> |
---|
1095 | </span>The error message will sometimes show where error is encountered, though |
---|
1096 | not in this case. </p> |
---|
1097 | |
---|
1098 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1099 | |
---|
1100 | <p class=MsoListParagraphCxSpMiddle>When the expression is complete, a new |
---|
1101 | table appears where the arbitrary <b style='mso-bidi-font-weight:normal'><span |
---|
1102 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1103 | mso-hansi-theme-font:major-latin'>c</span></b> and <b style='mso-bidi-font-weight: |
---|
1104 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1105 | major-latin;mso-hansi-theme-font:major-latin'>b</span></b> labels will be |
---|
1106 | assigned.</p> |
---|
1107 | |
---|
1108 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1109 | |
---|
1110 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1111 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_5" o:spid="_x0000_i1050" |
---|
1112 | type="#_x0000_t75" style='width:309.75pt;height:152.25pt;visibility:visible; |
---|
1113 | mso-wrap-style:square'> |
---|
1114 | <v:imagedata src="ParametricFitting_files/image008.png" o:title="" croptop="4435f" |
---|
1115 | cropbottom="8537f" cropleft="3852f" cropright="3650f"/> |
---|
1116 | </v:shape><![endif]--><![if !vml]><img border=0 width=413 height=203 |
---|
1117 | src="ParametricFitting_files/image009.png" v:shapes="Picture_x0020_5"><![endif]></span></p> |
---|
1118 | |
---|
1119 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1120 | |
---|
1121 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l2 level1 lfo4'><![if !supportLists]><span |
---|
1122 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1123 | style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> |
---|
1124 | </span></span></span><![endif]><!--[if gte vml 1]><v:shape id="Picture_x0020_6" |
---|
1125 | o:spid="_x0000_s1030" type="#_x0000_t75" style='position:absolute;left:0; |
---|
1126 | text-align:left;margin-left:37.3pt;margin-top:1143.2pt;width:88.5pt;height:65.5pt; |
---|
1127 | z-index:251659264;visibility:visible;mso-wrap-style:square; |
---|
1128 | mso-width-percent:0;mso-height-percent:0;mso-wrap-distance-left:9pt; |
---|
1129 | mso-wrap-distance-top:0;mso-wrap-distance-right:9pt; |
---|
1130 | mso-wrap-distance-bottom:0;mso-position-horizontal:right; |
---|
1131 | mso-position-horizontal-relative:margin;mso-position-vertical:absolute; |
---|
1132 | mso-position-vertical-relative:margin;mso-width-percent:0; |
---|
1133 | mso-height-percent:0;mso-width-relative:page;mso-height-relative:page'> |
---|
1134 | <v:imagedata src="ParametricFitting_files/image010.png" o:title=""/> |
---|
1135 | <w:wrap type="square" anchorx="margin" anchory="margin"/> |
---|
1136 | </v:shape><![endif]--><![if !vml]><img width=118 height=87 |
---|
1137 | src="ParametricFitting_files/image011.jpg" align=right hspace=12 v:shapes="Picture_x0020_6"><![endif]>Assign |
---|
1138 | the label for the numerator by clicking on the menu button next to label <b |
---|
1139 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1140 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b>; |
---|
1141 | this will bring up a list of variable types, from this select <b |
---|
1142 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1143 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>Phase</span></b> |
---|
1144 | to bring up a list of phase variables, from that list select variable <b |
---|
1145 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1146 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>0::b</span></b>, |
---|
1147 | which is the <i style='mso-bidi-font-style:normal'>b</i> lattice parameter for |
---|
1148 | phase 0 (CuCr<sub>2</sub>O<sub>4</sub>). Repeat this process to select assign |
---|
1149 | to label <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1150 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>c</span></b> |
---|
1151 | variable <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1152 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>0::b</span></b>.</p> |
---|
1153 | |
---|
1154 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1155 | |
---|
1156 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1157 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_8" o:spid="_x0000_i1049" |
---|
1158 | type="#_x0000_t75" style='width:315.75pt;height:129pt;visibility:visible; |
---|
1159 | mso-wrap-style:square'> |
---|
1160 | <v:imagedata src="ParametricFitting_files/image012.png" o:title="" croptop="4597f" |
---|
1161 | cropbottom="9873f" cropleft="3348f" cropright="3506f"/> |
---|
1162 | </v:shape><![endif]--><![if !vml]><img border=0 width=421 height=172 |
---|
1163 | src="ParametricFitting_files/image013.png" v:shapes="Picture_x0020_8"><![endif]></span></p> |
---|
1164 | |
---|
1165 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1166 | |
---|
1167 | <p class=MsoListParagraphCxSpMiddle>As each variable is set, the window shows |
---|
1168 | the value for each variable from the first refinement and when the expression |
---|
1169 | can be evaluated, the value for the expression, evaluated for that first |
---|
1170 | refinement. Only when the expression can be evaluated can the <b |
---|
1171 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1172 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>OK</span></b> |
---|
1173 | button be pressed. </p> |
---|
1174 | |
---|
1175 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1176 | |
---|
1177 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1178 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_9" o:spid="_x0000_i1048" |
---|
1179 | type="#_x0000_t75" style='width:314.25pt;height:153.75pt;visibility:visible; |
---|
1180 | mso-wrap-style:square'> |
---|
1181 | <v:imagedata src="ParametricFitting_files/image014.png" o:title="" croptop="3770f" |
---|
1182 | cropbottom="8549f" cropleft="3371f" cropright="3424f"/> |
---|
1183 | </v:shape><![endif]--><![if !vml]><img border=0 width=419 height=205 |
---|
1184 | src="ParametricFitting_files/image015.png" v:shapes="Picture_x0020_9"><![endif]></span></p> |
---|
1185 | |
---|
1186 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1187 | |
---|
1188 | <p class=MsoListParagraphCxSpMiddle>Press<b style='mso-bidi-font-weight:normal'> |
---|
1189 | </b><b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1190 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>OK</span></b> |
---|
1191 | to close the window and add the pseudo-variable. Note that a new column appears |
---|
1192 | at the end of the sequential refinement data table. </p> |
---|
1193 | |
---|
1194 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1195 | |
---|
1196 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1197 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_10" o:spid="_x0000_i1047" |
---|
1198 | type="#_x0000_t75" style='width:354pt;height:180.75pt;visibility:visible; |
---|
1199 | mso-wrap-style:square'> |
---|
1200 | <v:imagedata src="ParametricFitting_files/image016.png" o:title=""/> |
---|
1201 | </v:shape><![endif]--><![if !vml]><img border=0 width=472 height=241 |
---|
1202 | src="ParametricFitting_files/image016.png" v:shapes="Picture_x0020_10"><![endif]></span></p> |
---|
1203 | |
---|
1204 | <p class=MsoListParagraphCxSpMiddle><!--[if gte vml 1]><v:shape id="Picture_x0020_11" |
---|
1205 | o:spid="_x0000_s1029" type="#_x0000_t75" style='position:absolute;left:0; |
---|
1206 | text-align:left;margin-left:42.3pt;margin-top:666.2pt;width:93.5pt;height:39pt; |
---|
1207 | z-index:251660288;visibility:visible;mso-wrap-style:square; |
---|
1208 | mso-width-percent:0;mso-height-percent:0;mso-wrap-distance-left:9pt; |
---|
1209 | mso-wrap-distance-top:0;mso-wrap-distance-right:9pt; |
---|
1210 | mso-wrap-distance-bottom:0;mso-position-horizontal:right; |
---|
1211 | mso-position-horizontal-relative:margin;mso-position-vertical:absolute; |
---|
1212 | mso-position-vertical-relative:margin;mso-width-percent:0; |
---|
1213 | mso-height-percent:0;mso-width-relative:page;mso-height-relative:page'> |
---|
1214 | <v:imagedata src="ParametricFitting_files/image018.png" o:title=""/> |
---|
1215 | <w:wrap type="square" anchorx="margin" anchory="margin"/> |
---|
1216 | </v:shape><![endif]--><![if !vml]><img width=125 height=52 |
---|
1217 | src="ParametricFitting_files/image019.jpg" align=right hspace=12 v:shapes="Picture_x0020_11"><![endif]>Also |
---|
1218 | note that positioning the mouse above any cell in the table and waiting for a |
---|
1219 | few seconds causes the s.u. to be shown as a tooltip. </p> |
---|
1220 | |
---|
1221 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1222 | |
---|
1223 | <p class=MsoListParagraphCxSpMiddle>Double clicking on the <b style='mso-bidi-font-weight: |
---|
1224 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1225 | major-latin;mso-hansi-theme-font:major-latin'>b/c</span></b> column will cause |
---|
1226 | the pseudo-variable to be plotted:</p> |
---|
1227 | |
---|
1228 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1229 | |
---|
1230 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1231 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_12" o:spid="_x0000_i1046" |
---|
1232 | type="#_x0000_t75" style='width:351.75pt;height:303pt;visibility:visible; |
---|
1233 | mso-wrap-style:square'> |
---|
1234 | <v:imagedata src="ParametricFitting_files/image020.png" o:title=""/> |
---|
1235 | </v:shape><![endif]--><![if !vml]><img border=0 width=469 height=404 |
---|
1236 | src="ParametricFitting_files/image020.png" v:shapes="Picture_x0020_12"><![endif]></span></p> |
---|
1237 | |
---|
1238 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1239 | |
---|
1240 | <p class=MsoListParagraphCxSpMiddle>Press the "<b style='mso-bidi-font-weight: |
---|
1241 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1242 | major-latin;mso-hansi-theme-font:major-latin'>s</span></b>" key inside the |
---|
1243 | plot to select<b style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight: |
---|
1244 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1245 | major-latin;mso-hansi-theme-font:major-latin'>Temperature</span></b> as the |
---|
1246 | x-axis. </p> |
---|
1247 | |
---|
1248 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1249 | |
---|
1250 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1251 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_13" o:spid="_x0000_i1045" |
---|
1252 | type="#_x0000_t75" style='width:162.75pt;height:156pt;visibility:visible; |
---|
1253 | mso-wrap-style:square'> |
---|
1254 | <v:imagedata src="ParametricFitting_files/image022.png" o:title="" croptop="4105f" |
---|
1255 | cropbottom="8920f" cropleft="6109f" cropright="5911f"/> |
---|
1256 | </v:shape><![endif]--><![if !vml]><img border=0 width=217 height=208 |
---|
1257 | src="ParametricFitting_files/image023.png" v:shapes="Picture_x0020_13"><![endif]></span></p> |
---|
1258 | |
---|
1259 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1260 | |
---|
1261 | <p class=MsoListParagraphCxSpMiddle>The plot will then appear as below:</p> |
---|
1262 | |
---|
1263 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1264 | |
---|
1265 | <p class=MsoListParagraphCxSpLast><span style='mso-fareast-language:EN-US; |
---|
1266 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_14" o:spid="_x0000_i1044" |
---|
1267 | type="#_x0000_t75" style='width:353.25pt;height:303.75pt;visibility:visible; |
---|
1268 | mso-wrap-style:square'> |
---|
1269 | <v:imagedata src="ParametricFitting_files/image024.png" o:title=""/> |
---|
1270 | </v:shape><![endif]--><![if !vml]><img border=0 width=471 height=405 |
---|
1271 | src="ParametricFitting_files/image024.png" v:shapes="Picture_x0020_14"><![endif]></span></p> |
---|
1272 | |
---|
1273 | <h1>Step 3: Fitting a simple parametric equation to the unit cell volume</h1> |
---|
1274 | |
---|
1275 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1276 | |
---|
1277 | <p class=MsoNormal>In the next few steps we will fit increasingly sophisticated |
---|
1278 | equations of state to different parameters. As a simple example, we can |
---|
1279 | double-click on<b style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight: |
---|
1280 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1281 | major-latin;mso-hansi-theme-font:major-latin'>0::Vol</span></b>, to plot the |
---|
1282 | unit volume for the first phase vs. T, and fit this to a straight line.<span |
---|
1283 | style='mso-spacerun:yes'> </span></p> |
---|
1284 | |
---|
1285 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1286 | |
---|
1287 | <p class=MsoListParagraphCxSpFirst><span style='mso-fareast-language:EN-US; |
---|
1288 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_15" o:spid="_x0000_i1043" |
---|
1289 | type="#_x0000_t75" style='width:356.25pt;height:305.25pt;visibility:visible; |
---|
1290 | mso-wrap-style:square'> |
---|
1291 | <v:imagedata src="ParametricFitting_files/image026.png" o:title=""/> |
---|
1292 | </v:shape><![endif]--><![if !vml]><img border=0 width=475 height=407 |
---|
1293 | src="ParametricFitting_files/image026.png" v:shapes="Picture_x0020_15"><![endif]></span></p> |
---|
1294 | |
---|
1295 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo6'><![if !supportLists]><span |
---|
1296 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1297 | style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> |
---|
1298 | </span></span></span><![endif]><!--[if gte vml 1]><v:shape id="Picture_x0020_16" |
---|
1299 | o:spid="_x0000_s1028" type="#_x0000_t75" style='position:absolute;left:0; |
---|
1300 | text-align:left;margin-left:21.8pt;margin-top:891.2pt;width:73pt;height:53pt; |
---|
1301 | z-index:251661312;visibility:visible;mso-wrap-style:square; |
---|
1302 | mso-width-percent:0;mso-height-percent:0;mso-wrap-distance-left:9pt; |
---|
1303 | mso-wrap-distance-top:0;mso-wrap-distance-right:9pt; |
---|
1304 | mso-wrap-distance-bottom:0;mso-position-horizontal:right; |
---|
1305 | mso-position-horizontal-relative:margin;mso-position-vertical:absolute; |
---|
1306 | mso-position-vertical-relative:margin;mso-width-percent:0; |
---|
1307 | mso-height-percent:0;mso-width-relative:margin;mso-height-relative:margin'> |
---|
1308 | <v:imagedata src="ParametricFitting_files/image028.png" o:title=""/> |
---|
1309 | <w:wrap type="square" anchorx="margin" anchory="margin"/> |
---|
1310 | </v:shape><![endif]--><![if !vml]><img width=97 height=71 |
---|
1311 | src="ParametricFitting_files/image029.jpg" align=right hspace=12 v:shapes="Picture_x0020_16"><![endif]>Click |
---|
1312 | on the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1313 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>Parametric |
---|
1314 | Fit/Add</span></b><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1315 | major-latin;mso-hansi-theme-font:major-latin'> <b style='mso-bidi-font-weight: |
---|
1316 | normal'>equation</b></span> menu item, which opens a window similar to what was |
---|
1317 | used before to create a pseudo-variable, except that here an equation is |
---|
1318 | defined.<span style='mso-spacerun:yes'> </span></p> |
---|
1319 | |
---|
1320 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1321 | |
---|
1322 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1323 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_17" o:spid="_x0000_i1042" |
---|
1324 | type="#_x0000_t75" style='width:311.25pt;height:152.25pt;visibility:visible; |
---|
1325 | mso-wrap-style:square'> |
---|
1326 | <v:imagedata src="ParametricFitting_files/image030.png" o:title="" croptop="4213f" |
---|
1327 | cropbottom="8982f" cropleft="3490f" cropright="3653f"/> |
---|
1328 | </v:shape><![endif]--><![if !vml]><img border=0 width=415 height=203 |
---|
1329 | src="ParametricFitting_files/image031.png" v:shapes="Picture_x0020_17"><![endif]></span></p> |
---|
1330 | |
---|
1331 | <p class=MsoListParagraphCxSpLast><o:p> </o:p></p> |
---|
1332 | |
---|
1333 | <p class=MsoNormal>We will want to fit the unit cell volume to an equation of |
---|
1334 | form <i style='mso-bidi-font-style:normal'>y = mx+b</i>, where y will be the |
---|
1335 | volume and x temperature and m and b will be best fit. </p> |
---|
1336 | |
---|
1337 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><o:p> </o:p></b></p> |
---|
1338 | |
---|
1339 | <p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l0 level1 lfo6'><![if !supportLists]><b |
---|
1340 | style='mso-bidi-font-weight:normal'><span style='mso-fareast-font-family:"Times New Roman"; |
---|
1341 | mso-bidi-font-family:"Times New Roman"'><span style='mso-list:Ignore'>2.<span |
---|
1342 | style='font:7.0pt "Times New Roman"'> </span></span></span></b><![endif]>Click |
---|
1343 | the<b style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight: |
---|
1344 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1345 | major-latin;mso-hansi-theme-font:major-latin'>↕ </span></b>button to select |
---|
1346 | a dependent variable for "y". From the phase list, select the unit |
---|
1347 | cell volume for the CuCr<sub>2</sub>O<sub>4</sub> phase, select<b |
---|
1348 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1349 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1350 | mso-hansi-theme-font:major-latin'>0::Vol</span></b> and then press<b |
---|
1351 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1352 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1353 | mso-hansi-theme-font:major-latin'>OK</span>.<o:p></o:p></b></p> |
---|
1354 | |
---|
1355 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1356 | |
---|
1357 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1358 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_19" o:spid="_x0000_i1041" |
---|
1359 | type="#_x0000_t75" style='width:314.25pt;height:132pt;visibility:visible; |
---|
1360 | mso-wrap-style:square'> |
---|
1361 | <v:imagedata src="ParametricFitting_files/image032.png" o:title="" croptop="3830f" |
---|
1362 | cropbottom="9359f" cropleft="3705f" cropright="3502f"/> |
---|
1363 | </v:shape><![endif]--><![if !vml]><img border=0 width=419 height=176 |
---|
1364 | src="ParametricFitting_files/image033.png" v:shapes="Picture_x0020_19"><![endif]></span></p> |
---|
1365 | |
---|
1366 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1367 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_20" o:spid="_x0000_i1040" |
---|
1368 | type="#_x0000_t75" style='width:311.25pt;height:155.25pt;visibility:visible; |
---|
1369 | mso-wrap-style:square'> |
---|
1370 | <v:imagedata src="ParametricFitting_files/image034.png" o:title="" croptop="3548f" |
---|
1371 | cropbottom="8549f" cropleft="3611f" cropright="3665f"/> |
---|
1372 | </v:shape><![endif]--><![if !vml]><img border=0 width=415 height=207 |
---|
1373 | src="ParametricFitting_files/image035.png" v:shapes="Picture_x0020_20"><![endif]></span></p> |
---|
1374 | |
---|
1375 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1376 | |
---|
1377 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo6'><![if !supportLists]><span |
---|
1378 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1379 | style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> |
---|
1380 | </span></span></span><![endif]>Now we enter the equation using Python syntax, |
---|
1381 | which is simply "<b style='mso-bidi-font-weight:normal'><span |
---|
1382 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1383 | mso-hansi-theme-font:major-latin'>m*x + b</span></b>", note that the use |
---|
1384 | of spaces and the choice of labels is arbitrary. If one were to accidentally |
---|
1385 | leave out the "<span style='font-family:Courier'>*</span>" and typed |
---|
1386 | "<span style='font-family:Courier'>mx</span>" then that would be considered |
---|
1387 | a label, if "<span style='font-family:Courier'>m x</span>" were |
---|
1388 | typed, an error message would be displayed. </p> |
---|
1389 | |
---|
1390 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1391 | |
---|
1392 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1393 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_21" o:spid="_x0000_i1039" |
---|
1394 | type="#_x0000_t75" style='width:315.75pt;height:155.25pt;visibility:visible; |
---|
1395 | mso-wrap-style:square'> |
---|
1396 | <v:imagedata src="ParametricFitting_files/image036.png" o:title="" croptop="3326f" |
---|
1397 | cropbottom="8766f" cropleft="3010f" cropright="3419f"/> |
---|
1398 | </v:shape><![endif]--><![if !vml]><img border=0 width=421 height=207 |
---|
1399 | src="ParametricFitting_files/image037.png" v:shapes="Picture_x0020_21"><![endif]></span></p> |
---|
1400 | |
---|
1401 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1402 | |
---|
1403 | <p class=MsoListParagraphCxSpMiddle>Then press <b style='mso-bidi-font-weight: |
---|
1404 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1405 | major-latin;mso-hansi-theme-font:major-latin'>Validate</span></b> or wait a few |
---|
1406 | seconds and a window changes, as above, allowing assignment of the three new |
---|
1407 | labels (<b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1408 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>m</span></b>, |
---|
1409 | <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1410 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>x</span></b>, |
---|
1411 | and <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1412 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b>). |
---|
1413 | </p> |
---|
1414 | |
---|
1415 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1416 | |
---|
1417 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo6'><![if !supportLists]><span |
---|
1418 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1419 | style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> |
---|
1420 | </span></span></span><![endif]><!--[if gte vml 1]><v:shape id="Picture_x0020_22" |
---|
1421 | o:spid="_x0000_s1027" type="#_x0000_t75" style='position:absolute;left:0; |
---|
1422 | text-align:left;margin-left:43.8pt;margin-top:603.2pt;width:95pt;height:35pt; |
---|
1423 | z-index:251662336;visibility:visible;mso-wrap-style:square; |
---|
1424 | mso-width-percent:0;mso-height-percent:0;mso-wrap-distance-left:9pt; |
---|
1425 | mso-wrap-distance-top:0;mso-wrap-distance-right:9pt; |
---|
1426 | mso-wrap-distance-bottom:0;mso-position-horizontal:right; |
---|
1427 | mso-position-horizontal-relative:margin;mso-position-vertical:absolute; |
---|
1428 | mso-position-vertical-relative:margin;mso-width-percent:0; |
---|
1429 | mso-height-percent:0;mso-width-relative:page;mso-height-relative:page'> |
---|
1430 | <v:imagedata src="ParametricFitting_files/image038.png" o:title=""/> |
---|
1431 | <w:wrap type="square" anchorx="margin" anchory="margin"/> |
---|
1432 | </v:shape><![endif]--><![if !vml]><img width=127 height=47 |
---|
1433 | src="ParametricFitting_files/image039.jpg" align=right hspace=12 v:shapes="Picture_x0020_22"><![endif]>Assign |
---|
1434 | <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1435 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b> |
---|
1436 | and <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1437 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>m</span></b> |
---|
1438 | as refinable free parameters: Click on the <b style='mso-bidi-font-weight: |
---|
1439 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1440 | major-latin;mso-hansi-theme-font:major-latin'>↕</span></b><span |
---|
1441 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1442 | mso-hansi-theme-font:major-latin'> </span>button next to b and select<b |
---|
1443 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1444 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1445 | mso-hansi-theme-font:major-latin'>Free</span></b>. Then repeat this for<b |
---|
1446 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1447 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1448 | mso-hansi-theme-font:major-latin'>m</span></b>. </p> |
---|
1449 | |
---|
1450 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1451 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_23" o:spid="_x0000_i1038" |
---|
1452 | type="#_x0000_t75" style='width:314.25pt;height:153pt;visibility:visible; |
---|
1453 | mso-wrap-style:square'> |
---|
1454 | <v:imagedata src="ParametricFitting_files/image040.png" o:title="" croptop="3992f" |
---|
1455 | cropbottom="8541f" cropleft="3250f" cropright="3415f"/> |
---|
1456 | </v:shape><![endif]--><![if !vml]><img border=0 width=419 height=204 |
---|
1457 | src="ParametricFitting_files/image041.png" v:shapes="Picture_x0020_23"><![endif]></span></p> |
---|
1458 | |
---|
1459 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1460 | |
---|
1461 | <p class=MsoListParagraphCxSpMiddle>It is not necessary to change the default |
---|
1462 | variable names, the initial values, or the refine flag. </p> |
---|
1463 | |
---|
1464 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1465 | |
---|
1466 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo6'><![if !supportLists]><span |
---|
1467 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1468 | style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'> |
---|
1469 | </span></span></span><![endif]><!--[if gte vml 1]><v:shape id="Picture_x0020_24" |
---|
1470 | o:spid="_x0000_s1026" type="#_x0000_t75" style='position:absolute;left:0; |
---|
1471 | text-align:left;margin-left:24.3pt;margin-top:837.2pt;width:75.5pt;height:26pt; |
---|
1472 | z-index:251663360;visibility:visible;mso-wrap-style:square; |
---|
1473 | mso-width-percent:0;mso-height-percent:0;mso-wrap-distance-left:9pt; |
---|
1474 | mso-wrap-distance-top:0;mso-wrap-distance-right:9pt; |
---|
1475 | mso-wrap-distance-bottom:0;mso-position-horizontal:right; |
---|
1476 | mso-position-horizontal-relative:margin;mso-position-vertical:absolute; |
---|
1477 | mso-position-vertical-relative:margin;mso-width-percent:0; |
---|
1478 | mso-height-percent:0;mso-width-relative:page;mso-height-relative:page'> |
---|
1479 | <v:imagedata src="ParametricFitting_files/image042.png" o:title=""/> |
---|
1480 | <w:wrap type="square" anchorx="margin" anchory="margin"/> |
---|
1481 | </v:shape><![endif]--><![if !vml]><img width=101 height=35 |
---|
1482 | src="ParametricFitting_files/image043.jpg" align=right hspace=12 v:shapes="Picture_x0020_24"><![endif]>To |
---|
1483 | set <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1484 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>x</span></b> |
---|
1485 | as the temperature, click on the <b style='mso-bidi-font-weight:normal'><span |
---|
1486 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1487 | mso-hansi-theme-font:major-latin'>↕</span></b><span style='font-family: |
---|
1488 | "Calibri","sans-serif";mso-ascii-theme-font:major-latin;mso-hansi-theme-font: |
---|
1489 | major-latin'> </span>button next to <b style='mso-bidi-font-weight:normal'><span |
---|
1490 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1491 | mso-hansi-theme-font:major-latin'>x</span></b>, select<b style='mso-bidi-font-weight: |
---|
1492 | normal'> </b><b style='mso-bidi-font-weight:normal'><span style='font-family: |
---|
1493 | "Calibri","sans-serif";mso-ascii-theme-font:major-latin;mso-hansi-theme-font: |
---|
1494 | major-latin'>Global</span>,</b> and then select<b style='mso-bidi-font-weight: |
---|
1495 | normal'> </b><b style='mso-bidi-font-weight:normal'><span style='font-family: |
---|
1496 | "Calibri","sans-serif";mso-ascii-theme-font:major-latin;mso-hansi-theme-font: |
---|
1497 | major-latin'>Temperature</span></b> from the list and click on<b |
---|
1498 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1499 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1500 | mso-hansi-theme-font:major-latin'>OK</span></b>.</p> |
---|
1501 | |
---|
1502 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1503 | |
---|
1504 | <p class=MsoListParagraphCxSpMiddle><span style='mso-spacerun:yes'> </span><span |
---|
1505 | style='mso-fareast-language:EN-US;mso-no-proof:yes'><!--[if gte vml 1]><v:shape |
---|
1506 | id="Picture_x0020_25" o:spid="_x0000_i1037" type="#_x0000_t75" style='width:245.25pt; |
---|
1507 | height:108.75pt;visibility:visible;mso-wrap-style:square'> |
---|
1508 | <v:imagedata src="ParametricFitting_files/image044.png" o:title="" croptop="5483f" |
---|
1509 | cropbottom="10984f" cropleft="4191f" cropright="4159f"/> |
---|
1510 | </v:shape><![endif]--><![if !vml]><img border=0 width=327 height=145 |
---|
1511 | src="ParametricFitting_files/image045.png" v:shapes="Picture_x0020_25"><![endif]></span></p> |
---|
1512 | |
---|
1513 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1514 | |
---|
1515 | <p class=MsoListParagraphCxSpMiddle>The window then changes, showing the values |
---|
1516 | of the dependent variable and the expression for the first refinement, as |
---|
1517 | below. <span style='mso-spacerun:yes'> </span>Optionally, the values for <b |
---|
1518 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1519 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>m</span></b> |
---|
1520 | and <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1521 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b> |
---|
1522 | could be changed manually and the displayed value will be updated when <b |
---|
1523 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1524 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>Validate</span></b> |
---|
1525 | is pressed or after a short delay.</p> |
---|
1526 | |
---|
1527 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1528 | |
---|
1529 | <p class=MsoListParagraphCxSpLast><span style='mso-fareast-language:EN-US; |
---|
1530 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_26" o:spid="_x0000_i1036" |
---|
1531 | type="#_x0000_t75" style='width:314.25pt;height:153pt;visibility:visible; |
---|
1532 | mso-wrap-style:square'> |
---|
1533 | <v:imagedata src="ParametricFitting_files/image046.png" o:title="" croptop="3992f" |
---|
1534 | cropbottom="8541f" cropleft="3490f" cropright="3294f"/> |
---|
1535 | </v:shape><![endif]--><![if !vml]><img border=0 width=419 height=204 |
---|
1536 | src="ParametricFitting_files/image047.png" v:shapes="Picture_x0020_26"><![endif]></span></p> |
---|
1537 | |
---|
1538 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1539 | |
---|
1540 | <p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l0 level1 lfo6'><![if !supportLists]><span |
---|
1541 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1542 | style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'> |
---|
1543 | </span></span></span><![endif]>Press the <b style='mso-bidi-font-weight:normal'><span |
---|
1544 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1545 | mso-hansi-theme-font:major-latin'>OK</span></b> button to save this parametric |
---|
1546 | fit. The <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1547 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b> |
---|
1548 | and <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1549 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>m</span></b> |
---|
1550 | values are then refined and the console shows the results:</p> |
---|
1551 | |
---|
1552 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo6'><![if !supportLists]><span |
---|
1553 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1554 | style='mso-list:Ignore'>7.<span style='font:7.0pt "Times New Roman"'> |
---|
1555 | </span></span></span><![endif]><o:p> </o:p></p> |
---|
1556 | |
---|
1557 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space: |
---|
1558 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:Courier'>Fit |
---|
1559 | Results<o:p></o:p></span></b></p> |
---|
1560 | |
---|
1561 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space: |
---|
1562 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:Courier'><span |
---|
1563 | style='mso-spacerun:yes'> </span>0::Vol = m*x +b<o:p></o:p></span></b></p> |
---|
1564 | |
---|
1565 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space: |
---|
1566 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:Courier'><span |
---|
1567 | style='mso-spacerun:yes'> </span>x<span style='mso-spacerun:yes'> </span>= |
---|
1568 | Temperature<o:p></o:p></span></b></p> |
---|
1569 | |
---|
1570 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space: |
---|
1571 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:Courier'><span |
---|
1572 | style='mso-spacerun:yes'> </span>b<span style='mso-spacerun:yes'> </span>= |
---|
1573 | 561.7722(26)<o:p></o:p></span></b></p> |
---|
1574 | |
---|
1575 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space: |
---|
1576 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:Courier'><span |
---|
1577 | style='mso-spacerun:yes'> </span>m<span style='mso-spacerun:yes'> </span>= |
---|
1578 | 0.014833(14)<o:p></o:p></span></b></p> |
---|
1579 | |
---|
1580 | |
---|
1581 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space: |
---|
1582 | auto'><span style='font-family:Courier'><o:p> </o:p></span></p> |
---|
1583 | |
---|
1584 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1585 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_27" o:spid="_x0000_i1035" |
---|
1586 | type="#_x0000_t75" style='width:350.25pt;height:302.25pt;visibility:visible; |
---|
1587 | mso-wrap-style:square'> |
---|
1588 | <v:imagedata src="ParametricFitting_files/image048.png" o:title=""/> |
---|
1589 | </v:shape><![endif]--><![if !vml]><img border=0 width=467 height=403 |
---|
1590 | src="ParametricFitting_files/image048.png" v:shapes="Picture_x0020_27"><![endif]></span><span |
---|
1591 | style='font-family:"Cambria","serif";mso-ascii-theme-font:minor-latin; |
---|
1592 | mso-hansi-theme-font:minor-latin'><o:p></o:p></span></p> |
---|
1593 | |
---|
1594 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1595 | |
---|
1596 | <p class=MsoListParagraphCxSpMiddle>Also, the plot shows the actual values and |
---|
1597 | the fit. Note that while the values are close to a straight line, the |
---|
1598 | deviations are huge compared to the estimated uncertainty values for the unit |
---|
1599 | cell volume (shown as very small error bars, unless the plot is |
---|
1600 | magnified).<span style='mso-spacerun:yes'> </span>If a linear relationship had |
---|
1601 | been defined as a constraint (as can be done with other software packages) <i>the |
---|
1602 | unit cell parameters would have been forced onto this line with no obvious |
---|
1603 | indication that this was not a correct result.</i> </p> |
---|
1604 | |
---|
1605 | <p class=MsoListParagraphCxSpLast><span style='mso-spacerun:yes'> </span></p> |
---|
1606 | |
---|
1607 | <h1>Step 4: Examples of more complex fitt<span class=Heading1Char><span |
---|
1608 | style='font-weight:normal'>i</span></span>ng equations</h1> |
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1609 | |
---|
1610 | <p class=MsoNormal><o:p> </o:p></p> |
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1611 | |
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1612 | <p class=MsoNormal>Here we will look at how more sophisticated Python |
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1613 | capabilities can be used to fit more complex behavior.<span |
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1614 | style='mso-spacerun:yes'> </span></p> |
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1615 | |
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1616 | <p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l1 level1 lfo8'><![if !supportLists]><span |
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1617 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1618 | style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> |
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1619 | </span></span></span><![endif]>Optionally Double-click on the<b |
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1620 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
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1621 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1622 | mso-hansi-theme-font:major-latin'>0::c</span> </b>column. Note the changes in |
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1623 | the <i style='mso-bidi-font-style:normal'>c</i> unit cell parameter as a |
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1624 | function of temperature, as shown below. </p> |
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1625 | |
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1626 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
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1627 | |
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1628 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1629 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_28" o:spid="_x0000_i1034" |
---|
1630 | type="#_x0000_t75" style='width:350.25pt;height:303pt;visibility:visible; |
---|
1631 | mso-wrap-style:square'> |
---|
1632 | <v:imagedata src="ParametricFitting_files/image050.png" o:title=""/> |
---|
1633 | </v:shape><![endif]--><![if !vml]><img border=0 width=467 height=404 |
---|
1634 | src="ParametricFitting_files/image050.png" v:shapes="Picture_x0020_28"><![endif]></span></p> |
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1635 | |
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1636 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
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1637 | |
---|
1638 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo8'><![if !supportLists]><span |
---|
1639 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1640 | style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> |
---|
1641 | </span></span></span><![endif]>We will now fit <i style='mso-bidi-font-style: |
---|
1642 | normal'>c</i> as a function of form 1/(1 + exp[k(t-t<sub>0</sub>)]). Select the<b |
---|
1643 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1644 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1645 | mso-hansi-theme-font:major-latin'>Parametric Fit/Add</span></b><span |
---|
1646 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1647 | mso-hansi-theme-font:major-latin'> <b style='mso-bidi-font-weight:normal'>equation</b></span> |
---|
1648 | menu item (as before). For the dependent variable, click on<b style='mso-bidi-font-weight: |
---|
1649 | normal'> </b><b style='mso-bidi-font-weight:normal'><span style='font-family: |
---|
1650 | "Calibri","sans-serif";mso-ascii-theme-font:major-latin;mso-hansi-theme-font: |
---|
1651 | major-latin'>Phase</span></b> and then select<b style='mso-bidi-font-weight: |
---|
1652 | normal'> </b><b style='mso-bidi-font-weight:normal'><span style='font-family: |
---|
1653 | "Calibri","sans-serif";mso-ascii-theme-font:major-latin;mso-hansi-theme-font: |
---|
1654 | major-latin'>0::c</span></b>.<span style='mso-spacerun:yes'> </span></p> |
---|
1655 | |
---|
1656 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1657 | |
---|
1658 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo8'><![if !supportLists]><span |
---|
1659 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1660 | style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> |
---|
1661 | </span></span></span><![endif]>We then enter expression</p> |
---|
1662 | |
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1663 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
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1664 | |
---|
1665 | <p class=MsoListParagraphCxSpMiddle style='text-indent:.5in'><b |
---|
1666 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1667 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b + c / |
---|
1668 | (1+math.exp(k*(t-t0)))<o:p></o:p></span></b></p> |
---|
1669 | |
---|
1670 | <p class=MsoListParagraphCxSpMiddle><span style='font-family:"Cambria","serif"; |
---|
1671 | mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'><o:p> </o:p></span></p> |
---|
1672 | |
---|
1673 | <p class=MsoListParagraphCxSpLast>Note that use of spaces here is arbitrary, |
---|
1674 | but all parentheses are required. Also note that the exponential function |
---|
1675 | [exp(x) or e<sup>x</sup>] is supplied in Python in the math and numpy modules |
---|
1676 | as math.exp(), numpy.exp(). Either of these can be used as well as the |
---|
1677 | convenience abbreviation of np.exp(). Further, there are also a small number of |
---|
1678 | common functions that are defined without the prefix for convenience [these |
---|
1679 | include pi, exp(), sqrt(), sind(), cosd(), tand() where d indicates an argument |
---|
1680 | in degrees.]</p> |
---|
1681 | |
---|
1682 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1683 | |
---|
1684 | <p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l1 level1 lfo8'><![if !supportLists]><span |
---|
1685 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1686 | style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> |
---|
1687 | </span></span></span><![endif]>Assign free variables to<b style='mso-bidi-font-weight: |
---|
1688 | normal'> </b><b style='mso-bidi-font-weight:normal'><span style='font-family: |
---|
1689 | "Calibri","sans-serif";mso-ascii-theme-font:major-latin;mso-hansi-theme-font: |
---|
1690 | major-latin'>b</span>, </b><b style='mso-bidi-font-weight:normal'><span |
---|
1691 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1692 | mso-hansi-theme-font:major-latin'>c</span>, </b><b style='mso-bidi-font-weight: |
---|
1693 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1694 | major-latin;mso-hansi-theme-font:major-latin'>k</span> </b>and<b |
---|
1695 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1696 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1697 | mso-hansi-theme-font:major-latin'>t0</span></b>, similar as to what was done |
---|
1698 | before. Note that the<b style='mso-bidi-font-weight:normal'> </b>variable name |
---|
1699 | for the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1700 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b> |
---|
1701 | label was set automatically to <b style='mso-bidi-font-weight:normal'><span |
---|
1702 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1703 | mso-hansi-theme-font:major-latin'>b_1</span></b>. If the same variable name (<b |
---|
1704 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1705 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b>) |
---|
1706 | was used again here, the same value would be used to fit both equations, which |
---|
1707 | is certainly not what we want here.<span style='mso-spacerun:yes'> </span>Finally, |
---|
1708 | since this equation is too complex to fit without some reasonable starting |
---|
1709 | values, specify an approximate value, <b style='mso-bidi-font-weight:normal'><span |
---|
1710 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1711 | mso-hansi-theme-font:major-latin'>120</span></b>, for the vicinity of where the <i |
---|
1712 | style='mso-bidi-font-style:normal'>c</i> lattice parameter starts to |
---|
1713 | change (<b style='mso-bidi-font-weight: |
---|
1714 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1715 | major-latin;mso-hansi-theme-font:major-latin'>t0</span></b>) and |
---|
1716 | non-zero values for variables <B>c</B> and <B>k</B>.</p> |
---|
1717 | |
---|
1718 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1719 | |
---|
1720 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1721 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_40" o:spid="_x0000_i1033" |
---|
1722 | type="#_x0000_t75" style='width:317.25pt;height:171pt;visibility:visible; |
---|
1723 | mso-wrap-style:square'> |
---|
1724 | <v:imagedata src="ParametricFitting_files/image052.png" o:title=""/> |
---|
1725 | </v:shape><![endif]--><![if !vml]><img border=0 width=423 height=228 |
---|
1726 | src="ParametricFitting_files/image052.png" v:shapes="Picture_x0020_40"><![endif]></span></p> |
---|
1727 | |
---|
1728 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1729 | |
---|
1730 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo8'><![if !supportLists]><span |
---|
1731 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1732 | style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'> |
---|
1733 | </span></span></span><![endif]>Optionally, press the <b style='mso-bidi-font-weight: |
---|
1734 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1735 | major-latin;mso-hansi-theme-font:major-latin'>Fit</span></b> button to see if |
---|
1736 | the equation can be refined with starting values of zero for the other three |
---|
1737 | parameters.<span style='mso-spacerun:yes'> </span>A fit is obtained and is |
---|
1738 | plotted. </p> |
---|
1739 | |
---|
1740 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1741 | |
---|
1742 | <p class=MsoListParagraphCxSpMiddle><span style='mso-spacerun:yes'> </span><span |
---|
1743 | style='mso-fareast-language:EN-US;mso-no-proof:yes'><!--[if gte vml 1]><v:shape |
---|
1744 | id="Picture_x0020_41" o:spid="_x0000_i1032" type="#_x0000_t75" style='width:317.25pt; |
---|
1745 | height:168.75pt;visibility:visible;mso-wrap-style:square'> |
---|
1746 | <v:imagedata src="ParametricFitting_files/image054.png" o:title=""/> |
---|
1747 | </v:shape><![endif]--><![if !vml]><img border=0 width=423 height=225 |
---|
1748 | src="ParametricFitting_files/image054.png" v:shapes="Picture_x0020_41"><![endif]></span></p> |
---|
1749 | |
---|
1750 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1751 | |
---|
1752 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo8'><![if !supportLists]><span |
---|
1753 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1754 | style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'> |
---|
1755 | </span></span></span><![endif]>Press <b style='mso-bidi-font-weight:normal'><span |
---|
1756 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1757 | mso-hansi-theme-font:major-latin'>OK</span></b> to add this equation to the |
---|
1758 | parametric fits and both equations are refit (and if the label for <b |
---|
1759 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1760 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b</span></b> |
---|
1761 | had not been changed, applying the constraint that <b style='mso-bidi-font-weight: |
---|
1762 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1763 | major-latin;mso-hansi-theme-font:major-latin'>b</span></b> must be the same for |
---|
1764 | both equations.) </p> |
---|
1765 | |
---|
1766 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1767 | |
---|
1768 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1769 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_32" o:spid="_x0000_i1031" |
---|
1770 | type="#_x0000_t75" style='width:353.25pt;height:300.75pt;visibility:visible; |
---|
1771 | mso-wrap-style:square'> |
---|
1772 | <v:imagedata src="ParametricFitting_files/image056.png" o:title=""/> |
---|
1773 | </v:shape><![endif]--><![if !vml]><img border=0 width=471 height=401 |
---|
1774 | src="ParametricFitting_files/image056.png" v:shapes="Picture_x0020_32"><![endif]></span></p> |
---|
1775 | |
---|
1776 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1777 | |
---|
1778 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo8'><![if !supportLists]><span |
---|
1779 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1780 | style='mso-list:Ignore'>7.<span style='font:7.0pt "Times New Roman"'> |
---|
1781 | </span></span></span><![endif]>We will now try a more complex equation for the |
---|
1782 | same data, where we set the value to <b style='mso-bidi-font-weight:normal'><span |
---|
1783 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1784 | mso-hansi-theme-font:major-latin'>b</span></b> for temperatures less than <b |
---|
1785 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1786 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>t0</span></b> |
---|
1787 | and a critical phenomenon formulism [(t-t<sub>0</sub>)<sup>-a</sup>] for |
---|
1788 | temperatures above <b style='mso-bidi-font-weight:normal'><span |
---|
1789 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1790 | mso-hansi-theme-font:major-latin'>t0</span></b>. To do this we use the Python |
---|
1791 | syntax "<b style='mso-bidi-font-weight:normal'><span style='font-family: |
---|
1792 | "Calibri","sans-serif";mso-ascii-theme-font:major-latin;mso-hansi-theme-font: |
---|
1793 | major-latin'>x1 if testexp else x2</span></b>" which is <b |
---|
1794 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1795 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>x1</span></b> |
---|
1796 | where the test expression (<b style='mso-bidi-font-weight:normal'><span |
---|
1797 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1798 | mso-hansi-theme-font:major-latin'>testexp</span></b> here) is <b |
---|
1799 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1800 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>True</span></b> |
---|
1801 | and <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1802 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>x2</span></b> |
---|
1803 | otherwise. Thus we can use an expression such as:</p> |
---|
1804 | |
---|
1805 | <p class=MsoListParagraphCxSpMiddle><span style='mso-spacerun:yes'> </span></p> |
---|
1806 | |
---|
1807 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: |
---|
1808 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1809 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b if t <= |
---|
1810 | t0 else b + c * (1-(t-t0)**d)<o:p></o:p></span></b></p> |
---|
1811 | |
---|
1812 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: |
---|
1813 | auto'><span style='font-family:Courier'><o:p> </o:p></span></p> |
---|
1814 | |
---|
1815 | <p class=MsoListParagraphCxSpMiddle>This may be easier to read with the |
---|
1816 | inclusion of extra parentheses (that have no effect on the execution):<span |
---|
1817 | style='font-family:"Cambria","serif";mso-ascii-theme-font:minor-latin; |
---|
1818 | mso-hansi-theme-font:minor-latin'><o:p></o:p></span></p> |
---|
1819 | |
---|
1820 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1821 | |
---|
1822 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: |
---|
1823 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1824 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b if (t |
---|
1825 | <= t0) else (b + c * (1-(t-t0)**d))<o:p></o:p></span></b></p> |
---|
1826 | |
---|
1827 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: |
---|
1828 | auto'><span style='font-family:Courier'><o:p> </o:p></span></p> |
---|
1829 | |
---|
1830 | <p class=MsoListParagraphCxSpMiddle>As before, add an equation (or edit an |
---|
1831 | existing one), set the dependent variable to <b style='mso-bidi-font-weight: |
---|
1832 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1833 | major-latin;mso-hansi-theme-font:major-latin'>0::c</span></b>, enter the |
---|
1834 | expression and assign the free and fixed variables, as before. Set the exponent |
---|
1835 | and the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1836 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>t0</span></b> |
---|
1837 | values to initial values of <b style='mso-bidi-font-weight:normal'><span |
---|
1838 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1839 | mso-hansi-theme-font:major-latin'>-0.025</span></b> and <b style='mso-bidi-font-weight: |
---|
1840 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1841 | major-latin;mso-hansi-theme-font:major-latin'>120</span></b>, respectively, and |
---|
1842 | turn off their refinement flags. Then press <b style='mso-bidi-font-weight: |
---|
1843 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1844 | major-latin;mso-hansi-theme-font:major-latin'>Fit</span></b>.<span |
---|
1845 | style='font-family:"Cambria","serif";mso-ascii-theme-font:minor-latin; |
---|
1846 | mso-hansi-theme-font:minor-latin'><o:p></o:p></span></p> |
---|
1847 | |
---|
1848 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1849 | mso-no-proof:yes'><o:p> </o:p></span></p> |
---|
1850 | |
---|
1851 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1852 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_42" o:spid="_x0000_i1030" |
---|
1853 | type="#_x0000_t75" style='width:315.75pt;height:168.75pt;visibility:visible; |
---|
1854 | mso-wrap-style:square'> |
---|
1855 | <v:imagedata src="ParametricFitting_files/image058.png" o:title=""/> |
---|
1856 | </v:shape><![endif]--><![if !vml]><img border=0 width=421 height=225 |
---|
1857 | src="ParametricFitting_files/image058.png" v:shapes="Picture_x0020_42"><![endif]></span></p> |
---|
1858 | |
---|
1859 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
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1860 | |
---|
1861 | <p class=MsoListParagraphCxSpMiddle>Then turn refinement of <b |
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1862 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
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1863 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>t0</span></b> |
---|
1864 | back on and press <b style='mso-bidi-font-weight:normal'><span |
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1865 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
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1866 | mso-hansi-theme-font:major-latin'>OK</span></b>. The resulting fit shows the |
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1867 | trends quite well: </p> |
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1868 | |
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1869 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
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1870 | |
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1871 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
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1872 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_35" o:spid="_x0000_i1029" |
---|
1873 | type="#_x0000_t75" style='width:351pt;height:302.25pt;visibility:visible; |
---|
1874 | mso-wrap-style:square'> |
---|
1875 | <v:imagedata src="ParametricFitting_files/image060.png" o:title=""/> |
---|
1876 | </v:shape><![endif]--><![if !vml]><img border=0 width=468 height=403 |
---|
1877 | src="ParametricFitting_files/image060.png" v:shapes="Picture_x0020_35"><![endif]></span></p> |
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1878 | |
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1879 | <p class=MsoListParagraphCxSpLast><o:p> </o:p></p> |
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1880 | |
---|
1881 | <h1>Step 5: Fitting to a Pseudo Variable</h1> |
---|
1882 | |
---|
1883 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1884 | |
---|
1885 | <p class=MsoNormal>One can fit a function to a pseudo variable, just as to a |
---|
1886 | direct variable. If we look at the plot shown in Step 2, it appears there are |
---|
1887 | two regions. We can treat the lower range as a power-law growth, T<sup>k</sup>, |
---|
1888 | and the upper region as linear (m*T + b). </p> |
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1889 | |
---|
1890 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1891 | |
---|
1892 | <p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l3 level1 lfo10'><![if !supportLists]><span |
---|
1893 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1894 | style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> |
---|
1895 | </span></span></span><![endif]>As before, add an equation<b style='mso-bidi-font-weight: |
---|
1896 | normal'> </b>(or edit an existing one). For the dependent variable, select<b |
---|
1897 | style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight:normal'><span |
---|
1898 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1899 | mso-hansi-theme-font:major-latin'>Global</span></b> to bring up that selection |
---|
1900 | of variables and select<b style='mso-bidi-font-weight:normal'> </b><b |
---|
1901 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1902 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>b/c</span> </b>and |
---|
1903 | press<b style='mso-bidi-font-weight:normal'> </b><b style='mso-bidi-font-weight: |
---|
1904 | normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: |
---|
1905 | major-latin;mso-hansi-theme-font:major-latin'>OK</span>. </b></p> |
---|
1906 | |
---|
1907 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1908 | |
---|
1909 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l3 level1 lfo10'><![if !supportLists]><span |
---|
1910 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1911 | style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> |
---|
1912 | </span></span></span><![endif]>Then enter the equation as </p> |
---|
1913 | |
---|
1914 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1915 | |
---|
1916 | <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: |
---|
1917 | auto'><b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1918 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin;mso-bidi-font-family: |
---|
1919 | "Lucida Grande";color:black'>(o1 + (a1*T)**k) if T < 120 else (o2 + a2*T</span></b><b |
---|
1920 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1921 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>)<o:p></o:p></span></b></p> |
---|
1922 | |
---|
1923 | <p class=MsoListParagraphCxSpMiddle><span style='font-family:"Cambria","serif"; |
---|
1924 | mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'><o:p> </o:p></span></p> |
---|
1925 | |
---|
1926 | <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l3 level1 lfo10'><![if !supportLists]><span |
---|
1927 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1928 | style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> |
---|
1929 | </span></span></span><![endif]>Assign the free and fixed variables, as shown |
---|
1930 | below. Note that the exponent (<b style='mso-bidi-font-weight:normal'><span |
---|
1931 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1932 | mso-hansi-theme-font:major-latin'>k</span></b>) and scaling factor (<b |
---|
1933 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
1934 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>a1</span></b>), |
---|
1935 | cannot start as zero<b style='mso-bidi-font-weight:normal'>. </b></p> |
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1936 | |
---|
1937 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
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1938 | |
---|
1939 | <p class=MsoListParagraphCxSpLast><span style='mso-fareast-language:EN-US; |
---|
1940 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_44" o:spid="_x0000_i1028" |
---|
1941 | type="#_x0000_t75" style='width:332.25pt;height:186pt;visibility:visible; |
---|
1942 | mso-wrap-style:square'> |
---|
1943 | <v:imagedata src="ParametricFitting_files/image062.png" o:title=""/> |
---|
1944 | </v:shape><![endif]--><![if !vml]><img border=0 width=443 height=248 |
---|
1945 | src="ParametricFitting_files/image062.png" v:shapes="Picture_x0020_44"><![endif]></span></p> |
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1946 | |
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1947 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1948 | |
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1949 | <p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l3 level1 lfo10'><![if !supportLists]><span |
---|
1950 | style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'><span |
---|
1951 | style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> |
---|
1952 | </span></span></span><![endif]>Press the <b style='mso-bidi-font-weight:normal'><span |
---|
1953 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
1954 | mso-hansi-theme-font:major-latin'>Fit</span></b> button and note that all the |
---|
1955 | free variables are adjusted </p> |
---|
1956 | |
---|
1957 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1958 | |
---|
1959 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1960 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_45" o:spid="_x0000_i1027" |
---|
1961 | type="#_x0000_t75" style='width:333.75pt;height:189pt;visibility:visible; |
---|
1962 | mso-wrap-style:square'> |
---|
1963 | <v:imagedata src="ParametricFitting_files/image064.png" o:title=""/> |
---|
1964 | </v:shape><![endif]--><![if !vml]><img border=0 width=445 height=252 |
---|
1965 | src="ParametricFitting_files/image064.png" v:shapes="Picture_x0020_45"><![endif]></span><span |
---|
1966 | style='mso-spacerun:yes'> </span></p> |
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1967 | |
---|
1968 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1969 | |
---|
1970 | <p class=MsoListParagraphCxSpMiddle>Also, that the plotted result is close to |
---|
1971 | the values from the refinement.</p> |
---|
1972 | |
---|
1973 | <p class=MsoListParagraphCxSpMiddle><o:p> </o:p></p> |
---|
1974 | |
---|
1975 | <p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US; |
---|
1976 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_48" o:spid="_x0000_i1026" |
---|
1977 | type="#_x0000_t75" style='width:348.75pt;height:302.25pt;visibility:visible; |
---|
1978 | mso-wrap-style:square'> |
---|
1979 | <v:imagedata src="ParametricFitting_files/image066.png" o:title=""/> |
---|
1980 | </v:shape><![endif]--><![if !vml]><img border=0 width=465 height=403 |
---|
1981 | src="ParametricFitting_files/image066.png" v:shapes="Picture_x0020_48"><![endif]></span></p> |
---|
1982 | |
---|
1983 | <p class=MsoListParagraphCxSpLast><o:p> </o:p></p> |
---|
1984 | |
---|
1985 | <p class=MsoNormal style='margin-left:.25in'><o:p> </o:p></p> |
---|
1986 | |
---|
1987 | <p class=MsoNormal>This completes this tutorial on use of Pseudo Variables and |
---|
1988 | parametric fitting. </p> |
---|
1989 | |
---|
1990 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1991 | |
---|
1992 | <h1>Advanced Use: Externally-Defined Functions</h1> |
---|
1993 | |
---|
1994 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1995 | |
---|
1996 | <p class=MsoNormal>The parametric refinement section of GSAS-II is intended to |
---|
1997 | be quite flexible, but for very complex fitting, a user may wish to define a custom |
---|
1998 | Python function. Such a function can be defined in a separate module that will |
---|
1999 | be accessed with a parametric equation (or pseudo variable).</p> |
---|
2000 | |
---|
2001 | <p class=MsoNormal><o:p> </o:p></p> |
---|
2002 | |
---|
2003 | <p class=MsoNormal>As an example of that, if we create a file called <b |
---|
2004 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2005 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>fittest.py</span></b> |
---|
2006 | and locate that file in any directory in the Python path (most simply, in the |
---|
2007 | directory where the project file, <b style='mso-bidi-font-weight:normal'><span |
---|
2008 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
2009 | mso-hansi-theme-font:major-latin'>SeqTut.gpx</span></b>, is located) and place |
---|
2010 | a routine <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2011 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>fitfxn</span></b> |
---|
2012 | in that module:</p> |
---|
2013 | |
---|
2014 | <blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'> |
---|
2015 | |
---|
2016 | <blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><o:p> </o:p></pre><pre><b |
---|
2017 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2018 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'># file fittest.py<o:p></o:p></span></b></pre><pre><b |
---|
2019 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2020 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'>def fitfxn(T,o1,o2,a1,a2,k):<o:p></o:p></span></b></pre><pre><b |
---|
2021 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2022 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'><span style='mso-spacerun:yes'> </span>if T < 120:<o:p></o:p></span></b></pre><pre><b |
---|
2023 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2024 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'><span style='mso-spacerun:yes'> </span>return o1 + (a1*T)**k<o:p></o:p></span></b></pre><pre><b |
---|
2025 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2026 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'><span style='mso-spacerun:yes'> </span>else:<o:p></o:p></span></b></pre><pre><b |
---|
2027 | style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; |
---|
2028 | mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin'><span style='mso-spacerun:yes'> </span>return o2 + a2*T<o:p></o:p></span></b></pre></blockquote> |
---|
2029 | |
---|
2030 | </blockquote> |
---|
2031 | |
---|
2032 | <p class=MsoNormal>The function <b style='mso-bidi-font-weight:normal'><span |
---|
2033 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
2034 | mso-hansi-theme-font:major-latin'>fittest.fitfxn</span></b> can then be used to |
---|
2035 | duplicate the previous example: </p> |
---|
2036 | |
---|
2037 | <p class=MsoNormal><o:p> </o:p></p> |
---|
2038 | |
---|
2039 | <p class=MsoNormal><span style='mso-fareast-language:EN-US;mso-no-proof:yes'><!--[if gte vml 1]><v:shape |
---|
2040 | id="Picture_x0020_47" o:spid="_x0000_i1025" type="#_x0000_t75" style='width:315pt; |
---|
2041 | height:185.25pt;visibility:visible;mso-wrap-style:square'> |
---|
2042 | <v:imagedata src="ParametricFitting_files/image068.png" o:title="" croptop="3393f" |
---|
2043 | cropbottom="7847f" cropleft="3471f" cropright="3290f"/> |
---|
2044 | </v:shape><![endif]--><![if !vml]><img border=0 width=420 height=247 |
---|
2045 | src="ParametricFitting_files/image069.png" v:shapes="Picture_x0020_47"><![endif]></span></p> |
---|
2046 | |
---|
2047 | <p class=MsoNormal><o:p> </o:p></p> |
---|
2048 | |
---|
2049 | <p class=MsoNormal>Note that module <b style='mso-bidi-font-weight:normal'><span |
---|
2050 | style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:major-latin; |
---|
2051 | mso-hansi-theme-font:major-latin'>fittest</span></b> is automatically located |
---|
2052 | and loaded, provided it is found in the path. No changes to the standard |
---|
2053 | distributed GSAS-II code are needed. Care to avoid use of a module name already |
---|
2054 | found in GSAS-II or Python is wise.</p> |
---|
2055 | |
---|
2056 | </div> |
---|
2057 | |
---|
2058 | </body> |
---|
2059 | |
---|
2060 | </html> |
---|