source: trunk/help/ParametricFitting.htm @ 1352

Last change on this file since 1352 was 1352, checked in by toby, 9 years ago

fix word's dog droppings

  • Property svn:mime-type set to text/html
File size: 92.0 KB
Line 
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381@font-face
382        {font-family:"Lucida Grande";
383        panose-1:2 11 6 0 4 5 2 2 2 4;
384        mso-font-charset:0;
385        mso-generic-font-family:auto;
386        mso-font-pitch:variable;
387        mso-font-signature:-520090897 1342218751 0 0 447 0;}
388 /* Style Definitions */
389p.MsoNormal, li.MsoNormal, div.MsoNormal
390        {mso-style-unhide:no;
391        mso-style-qformat:yes;
392        mso-style-parent:"";
393        margin:0in;
394        margin-bottom:.0001pt;
395        mso-pagination:widow-orphan;
396        font-size:12.0pt;
397        mso-bidi-font-size:10.0pt;
398        font-family:Cambria;
399        mso-ascii-font-family:Cambria;
400        mso-ascii-theme-font:minor-latin;
401        mso-fareast-font-family:"\FF2D\FF33 \660E\671D";
402        mso-fareast-theme-font:minor-fareast;
403        mso-hansi-font-family:Cambria;
404        mso-hansi-theme-font:minor-latin;
405        mso-bidi-font-family:"Times New Roman";
406        mso-bidi-theme-font:minor-bidi;
407        mso-fareast-language:JA;}
408h1
409        {mso-style-priority:9;
410        mso-style-unhide:no;
411        mso-style-qformat:yes;
412        mso-style-link:"Heading 1 Char";
413        mso-style-next:Normal;
414        margin-top:24.0pt;
415        margin-right:0in;
416        margin-bottom:0in;
417        margin-left:0in;
418        margin-bottom:.0001pt;
419        mso-pagination:widow-orphan lines-together;
420        page-break-after:avoid;
421        mso-outline-level:1;
422        font-size:16.0pt;
423        font-family:Calibri;
424        mso-ascii-font-family:Calibri;
425        mso-ascii-theme-font:major-latin;
426        mso-fareast-font-family:"\FF2D\FF33 \30B4\30B7\30C3\30AF";
427        mso-fareast-theme-font:major-fareast;
428        mso-hansi-font-family:Calibri;
429        mso-hansi-theme-font:major-latin;
430        mso-bidi-font-family:"Times New Roman";
431        mso-bidi-theme-font:major-bidi;
432        color:#345A8A;
433        mso-themecolor:accent1;
434        mso-themeshade:181;
435        mso-font-kerning:0pt;
436        mso-fareast-language:JA;}
437h2
438        {mso-style-priority:9;
439        mso-style-qformat:yes;
440        mso-style-link:"Heading 2 Char";
441        mso-style-next:Normal;
442        margin-top:10.0pt;
443        margin-right:0in;
444        margin-bottom:0in;
445        margin-left:0in;
446        margin-bottom:.0001pt;
447        mso-pagination:widow-orphan lines-together;
448        page-break-after:avoid;
449        mso-outline-level:2;
450        font-size:13.0pt;
451        font-family:Calibri;
452        mso-ascii-font-family:Calibri;
453        mso-ascii-theme-font:major-latin;
454        mso-fareast-font-family:"\FF2D\FF33 \30B4\30B7\30C3\30AF";
455        mso-fareast-theme-font:major-fareast;
456        mso-hansi-font-family:Calibri;
457        mso-hansi-theme-font:major-latin;
458        mso-bidi-font-family:"Times New Roman";
459        mso-bidi-theme-font:major-bidi;
460        color:#4F81BD;
461        mso-themecolor:accent1;
462        mso-fareast-language:JA;}
463a:link, span.MsoHyperlink
464        {mso-style-priority:99;
465        color:blue;
466        mso-themecolor:hyperlink;
467        text-decoration:underline;
468        text-underline:single;}
469a:visited, span.MsoHyperlinkFollowed
470        {mso-style-noshow:yes;
471        mso-style-priority:99;
472        color:purple;
473        mso-themecolor:followedhyperlink;
474        text-decoration:underline;
475        text-underline:single;}
476p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
477        {mso-style-noshow:yes;
478        mso-style-priority:99;
479        mso-style-link:"Balloon Text Char";
480        margin:0in;
481        margin-bottom:.0001pt;
482        mso-pagination:widow-orphan;
483        font-size:9.0pt;
484        font-family:"Lucida Grande";
485        mso-fareast-font-family:"\FF2D\FF33 \660E\671D";
486        mso-fareast-theme-font:minor-fareast;
487        mso-fareast-language:JA;}
488p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
489        {mso-style-priority:34;
490        mso-style-unhide:no;
491        mso-style-qformat:yes;
492        margin-top:0in;
493        margin-right:0in;
494        margin-bottom:0in;
495        margin-left:.5in;
496        margin-bottom:.0001pt;
497        mso-add-space:auto;
498        mso-pagination:widow-orphan;
499        font-size:12.0pt;
500        mso-bidi-font-size:10.0pt;
501        font-family:Cambria;
502        mso-ascii-font-family:Cambria;
503        mso-ascii-theme-font:minor-latin;
504        mso-fareast-font-family:"\FF2D\FF33 \660E\671D";
505        mso-fareast-theme-font:minor-fareast;
506        mso-hansi-font-family:Cambria;
507        mso-hansi-theme-font:minor-latin;
508        mso-bidi-font-family:"Times New Roman";
509        mso-bidi-theme-font:minor-bidi;
510        mso-fareast-language:JA;}
511p.MsoListParagraphCxSpFirst, li.MsoListParagraphCxSpFirst, div.MsoListParagraphCxSpFirst
512        {mso-style-priority:34;
513        mso-style-unhide:no;
514        mso-style-qformat:yes;
515        mso-style-type:export-only;
516        margin-top:0in;
517        margin-right:0in;
518        margin-bottom:0in;
519        margin-left:.5in;
520        margin-bottom:.0001pt;
521        mso-add-space:auto;
522        mso-pagination:widow-orphan;
523        font-size:12.0pt;
524        mso-bidi-font-size:10.0pt;
525        font-family:Cambria;
526        mso-ascii-font-family:Cambria;
527        mso-ascii-theme-font:minor-latin;
528        mso-fareast-font-family:"\FF2D\FF33 \660E\671D";
529        mso-fareast-theme-font:minor-fareast;
530        mso-hansi-font-family:Cambria;
531        mso-hansi-theme-font:minor-latin;
532        mso-bidi-font-family:"Times New Roman";
533        mso-bidi-theme-font:minor-bidi;
534        mso-fareast-language:JA;}
535p.MsoListParagraphCxSpMiddle, li.MsoListParagraphCxSpMiddle, div.MsoListParagraphCxSpMiddle
536        {mso-style-priority:34;
537        mso-style-unhide:no;
538        mso-style-qformat:yes;
539        mso-style-type:export-only;
540        margin-top:0in;
541        margin-right:0in;
542        margin-bottom:0in;
543        margin-left:.5in;
544        margin-bottom:.0001pt;
545        mso-add-space:auto;
546        mso-pagination:widow-orphan;
547        font-size:12.0pt;
548        mso-bidi-font-size:10.0pt;
549        font-family:Cambria;
550        mso-ascii-font-family:Cambria;
551        mso-ascii-theme-font:minor-latin;
552        mso-fareast-font-family:"\FF2D\FF33 \660E\671D";
553        mso-fareast-theme-font:minor-fareast;
554        mso-hansi-font-family:Cambria;
555        mso-hansi-theme-font:minor-latin;
556        mso-bidi-font-family:"Times New Roman";
557        mso-bidi-theme-font:minor-bidi;
558        mso-fareast-language:JA;}
559p.MsoListParagraphCxSpLast, li.MsoListParagraphCxSpLast, div.MsoListParagraphCxSpLast
560        {mso-style-priority:34;
561        mso-style-unhide:no;
562        mso-style-qformat:yes;
563        mso-style-type:export-only;
564        margin-top:0in;
565        margin-right:0in;
566        margin-bottom:0in;
567        margin-left:.5in;
568        margin-bottom:.0001pt;
569        mso-add-space:auto;
570        mso-pagination:widow-orphan;
571        font-size:12.0pt;
572        mso-bidi-font-size:10.0pt;
573        font-family:Cambria;
574        mso-ascii-font-family:Cambria;
575        mso-ascii-theme-font:minor-latin;
576        mso-fareast-font-family:"\FF2D\FF33 \660E\671D";
577        mso-fareast-theme-font:minor-fareast;
578        mso-hansi-font-family:Cambria;
579        mso-hansi-theme-font:minor-latin;
580        mso-bidi-font-family:"Times New Roman";
581        mso-bidi-theme-font:minor-bidi;
582        mso-fareast-language:JA;}
583span.Heading1Char
584        {mso-style-name:"Heading 1 Char";
585        mso-style-priority:9;
586        mso-style-unhide:no;
587        mso-style-locked:yes;
588        mso-style-link:"Heading 1";
589        mso-ansi-font-size:16.0pt;
590        mso-bidi-font-size:16.0pt;
591        font-family:Calibri;
592        mso-ascii-font-family:Calibri;
593        mso-ascii-theme-font:major-latin;
594        mso-fareast-font-family:"\FF2D\FF33 \30B4\30B7\30C3\30AF";
595        mso-fareast-theme-font:major-fareast;
596        mso-hansi-font-family:Calibri;
597        mso-hansi-theme-font:major-latin;
598        mso-bidi-font-family:"Times New Roman";
599        mso-bidi-theme-font:major-bidi;
600        color:#345A8A;
601        mso-themecolor:accent1;
602        mso-themeshade:181;
603        font-weight:bold;}
604span.Heading2Char
605        {mso-style-name:"Heading 2 Char";
606        mso-style-priority:9;
607        mso-style-unhide:no;
608        mso-style-locked:yes;
609        mso-style-link:"Heading 2";
610        mso-ansi-font-size:13.0pt;
611        mso-bidi-font-size:13.0pt;
612        font-family:Calibri;
613        mso-ascii-font-family:Calibri;
614        mso-ascii-theme-font:major-latin;
615        mso-fareast-font-family:"\FF2D\FF33 \30B4\30B7\30C3\30AF";
616        mso-fareast-theme-font:major-fareast;
617        mso-hansi-font-family:Calibri;
618        mso-hansi-theme-font:major-latin;
619        mso-bidi-font-family:"Times New Roman";
620        mso-bidi-theme-font:major-bidi;
621        color:#4F81BD;
622        mso-themecolor:accent1;
623        font-weight:bold;}
624span.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";}
637span.SpellE
638        {mso-style-name:"";
639        mso-spl-e:yes;}
640span.GramE
641        {mso-style-name:"";
642        mso-gram-e:yes;}
643.MsoChpDefault
644        {mso-style-type:export-only;
645        mso-default-props:yes;
646        font-size:10.0pt;
647        mso-ansi-font-size:10.0pt;
648        mso-bidi-font-size:10.0pt;
649        font-family:Cambria;
650        mso-ascii-font-family:Cambria;
651        mso-ascii-theme-font:minor-latin;
652        mso-fareast-font-family:"\FF2D\FF33 \660E\671D";
653        mso-fareast-theme-font:minor-fareast;
654        mso-hansi-font-family:Cambria;
655        mso-hansi-theme-font:minor-latin;
656        mso-bidi-font-family:"Times New Roman";
657        mso-bidi-theme-font:minor-bidi;
658        mso-fareast-language:JA;}
659@page WordSection1
660        {size:8.5in 11.0in;
661        margin:1.0in 1.25in 1.0in 1.25in;
662        mso-header-margin:.5in;
663        mso-footer-margin:.5in;
664        mso-paper-source:0;}
665div.WordSection1
666        {page:WordSection1;}
667 /* List Definitions */
668@list l0
669        {mso-list-id:109671306;
670        mso-list-type:hybrid;
671        mso-list-template-ids:129770836 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
672@list l0:level1
673        {mso-level-tab-stop:none;
674        mso-level-number-position:left;
675        text-indent:-.25in;}
676@list l0:level2
677        {mso-level-number-format:alpha-lower;
678        mso-level-tab-stop:none;
679        mso-level-number-position:left;
680        text-indent:-.25in;}
681@list l0:level3
682        {mso-level-number-format:roman-lower;
683        mso-level-tab-stop:none;
684        mso-level-number-position:right;
685        text-indent:-9.0pt;}
686@list l0:level4
687        {mso-level-tab-stop:none;
688        mso-level-number-position:left;
689        text-indent:-.25in;}
690@list l0:level5
691        {mso-level-number-format:alpha-lower;
692        mso-level-tab-stop:none;
693        mso-level-number-position:left;
694        text-indent:-.25in;}
695@list l0:level6
696        {mso-level-number-format:roman-lower;
697        mso-level-tab-stop:none;
698        mso-level-number-position:right;
699        text-indent:-9.0pt;}
700@list l0:level7
701        {mso-level-tab-stop:none;
702        mso-level-number-position:left;
703        text-indent:-.25in;}
704@list l0:level8
705        {mso-level-number-format:alpha-lower;
706        mso-level-tab-stop:none;
707        mso-level-number-position:left;
708        text-indent:-.25in;}
709@list l0:level9
710        {mso-level-number-format:roman-lower;
711        mso-level-tab-stop:none;
712        mso-level-number-position:right;
713        text-indent:-9.0pt;}
714@list l1
715        {mso-list-id:235746779;
716        mso-list-type:hybrid;
717        mso-list-template-ids:129770836 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
718@list l1:level1
719        {mso-level-tab-stop:none;
720        mso-level-number-position:left;
721        text-indent:-.25in;}
722@list l1:level2
723        {mso-level-number-format:alpha-lower;
724        mso-level-tab-stop:none;
725        mso-level-number-position:left;
726        text-indent:-.25in;}
727@list l1:level3
728        {mso-level-number-format:roman-lower;
729        mso-level-tab-stop:none;
730        mso-level-number-position:right;
731        text-indent:-9.0pt;}
732@list l1:level4
733        {mso-level-tab-stop:none;
734        mso-level-number-position:left;
735        text-indent:-.25in;}
736@list l1:level5
737        {mso-level-number-format:alpha-lower;
738        mso-level-tab-stop:none;
739        mso-level-number-position:left;
740        text-indent:-.25in;}
741@list l1:level6
742        {mso-level-number-format:roman-lower;
743        mso-level-tab-stop:none;
744        mso-level-number-position:right;
745        text-indent:-9.0pt;}
746@list l1:level7
747        {mso-level-tab-stop:none;
748        mso-level-number-position:left;
749        text-indent:-.25in;}
750@list l1:level8
751        {mso-level-number-format:alpha-lower;
752        mso-level-tab-stop:none;
753        mso-level-number-position:left;
754        text-indent:-.25in;}
755@list l1:level9
756        {mso-level-number-format:roman-lower;
757        mso-level-tab-stop:none;
758        mso-level-number-position:right;
759        text-indent:-9.0pt;}
760@list l2
761        {mso-list-id:584074573;
762        mso-list-type:hybrid;
763        mso-list-template-ids:-926633506 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
764@list l2:level1
765        {mso-level-tab-stop:none;
766        mso-level-number-position:left;
767        text-indent:-.25in;}
768@list l2:level2
769        {mso-level-number-format:alpha-lower;
770        mso-level-tab-stop:none;
771        mso-level-number-position:left;
772        text-indent:-.25in;}
773@list l2:level3
774        {mso-level-number-format:roman-lower;
775        mso-level-tab-stop:none;
776        mso-level-number-position:right;
777        text-indent:-9.0pt;}
778@list l2:level4
779        {mso-level-tab-stop:none;
780        mso-level-number-position:left;
781        text-indent:-.25in;}
782@list l2:level5
783        {mso-level-number-format:alpha-lower;
784        mso-level-tab-stop:none;
785        mso-level-number-position:left;
786        text-indent:-.25in;}
787@list l2:level6
788        {mso-level-number-format:roman-lower;
789        mso-level-tab-stop:none;
790        mso-level-number-position:right;
791        text-indent:-9.0pt;}
792@list l2:level7
793        {mso-level-tab-stop:none;
794        mso-level-number-position:left;
795        text-indent:-.25in;}
796@list l2:level8
797        {mso-level-number-format:alpha-lower;
798        mso-level-tab-stop:none;
799        mso-level-number-position:left;
800        text-indent:-.25in;}
801@list l2:level9
802        {mso-level-number-format:roman-lower;
803        mso-level-tab-stop:none;
804        mso-level-number-position:right;
805        text-indent:-9.0pt;}
806@list l3
807        {mso-list-id:786774986;
808        mso-list-type:hybrid;
809        mso-list-template-ids:-1684491798 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
810@list l3:level1
811        {mso-level-tab-stop:none;
812        mso-level-number-position:left;
813        text-indent:-.25in;}
814@list l3:level2
815        {mso-level-number-format:alpha-lower;
816        mso-level-tab-stop:none;
817        mso-level-number-position:left;
818        text-indent:-.25in;}
819@list l3:level3
820        {mso-level-number-format:roman-lower;
821        mso-level-tab-stop:none;
822        mso-level-number-position:right;
823        text-indent:-9.0pt;}
824@list l3:level4
825        {mso-level-tab-stop:none;
826        mso-level-number-position:left;
827        text-indent:-.25in;}
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1024</head>
1025
1026<body lang=EN-US link=blue vlink=purple style='tab-interval:.5in'>
1027
1028<div class=WordSection1>
1029
1030<h1>Parametric Fitting and Pseudo Variables for Sequential Fits</h1>
1031
1032<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1033
1034<p class=MsoNormal>Once a sequential fit has been performed, any function of
1035the fit parameters from the fit and <i style='mso-bidi-font-style:normal'>their
1036estimated uncertainty</i> (<span class=SpellE>s.u</span>.) can be computed by
1037defining one or more "pseudo-variables" (Pseudo <span class=SpellE>Vars</span>)
1038Note that the covariance matrix from the fit is used to provide appropriate
1039treatment the correlation in parameters with respect to uncertainty
1040estimation.<span style="mso-spacerun:yes">&nbsp; </span>In addition, parametric
1041equations in terms of sample parameters such as temperature and pressure, etc. can
1042be fit to either the parameters from the fit or the Pseudo Vars. </p>
1043
1044<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1045
1046<p class=MsoNormal>This tutorial assumes that the steps in the <span
1047style='mso-bidi-font-family:"Times New Roman"'><a href="SequentialTutorial.htm">Sequential
1048refinement of multiple datasets</a> tutorial have already been performed. <o:p></o:p></span></p>
1049
1050<p class=MsoNormal><span style='mso-bidi-font-family:"Times New Roman"'><o:p>&nbsp;</o:p></span></p>
1051
1052<h2>Step 1. Open the previous Sequential Fit</h2>
1053
1054<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1055
1056<p class=MsoListParagraph style='margin-bottom:6.0pt;text-indent:-.25in;
1057mso-list:l6 level1 lfo1'><![if !supportLists]><span style='mso-fareast-font-family:
1058Cambria;mso-fareast-theme-font:minor-latin;mso-bidi-font-family:Cambria;
1059mso-bidi-theme-font:minor-latin'><span style='mso-list:Ignore'>1.<span
1060style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]>Start
1061GSAS-II</p>
1062
1063<p class=MsoListParagraph style='margin-bottom:6.0pt;text-indent:-.25in;
1064mso-list:l6 level1 lfo1'><![if !supportLists]><span style='mso-fareast-font-family:
1065Cambria;mso-fareast-theme-font:minor-latin;mso-bidi-font-family:Cambria;
1066mso-bidi-theme-font:minor-latin'><span style='mso-list:Ignore'>2.<span
1067style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b
1068style='mso-bidi-font-weight:normal'>Click on the File/Open Project</b> menu
1069item to load file named <span class=SpellE><span style='font-family:Courier'>SeqTut.gpx</span></span>.
1070</p>
1071
1072<p class=MsoListParagraph style='margin-bottom:6.0pt;text-indent:-.25in;
1073mso-list:l6 level1 lfo1'><![if !supportLists]><span style='mso-fareast-font-family:
1074Cambria;mso-fareast-theme-font:minor-latin;mso-bidi-font-family:Cambria;
1075mso-bidi-theme-font:minor-latin'><span style='mso-list:Ignore'>3.<span
1076style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><b
1077style='mso-bidi-font-weight:normal'>Click on the Sequential results </b>item in
1078the data tree. The sequential refinement results data table is displayed, as
1079below. </p>
1080
1081<p class=MsoListParagraph style='margin-bottom:6.0pt'><span style='mso-fareast-language:
1082EN-US;mso-no-proof:yes'><!--[if gte vml 1]><v:shapetype id="_x0000_t75"
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1108
1109<h2>Step 2. Create a Pseudo <span class=SpellE>Var</span></h2>
1110
1111<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1112
1113<p class=MsoNormal>Pseudo <span class=SpellE>Vars</span> allow computation of
1114an arbitrarily defined function of combinations of the variables that are
1115displayed in the sequential refinement table. Any valid Python language
1116expression can be used to define this. While one can plot <i style='mso-bidi-font-style:
1117normal'>a</i>, <i style='mso-bidi-font-style:normal'>b</i> and <i
1118style='mso-bidi-font-style:normal'>c</i> axis lengths by clicking on the appropriate
1119column of the table, to compare them one might want to scale them. Alternately,
1120as will be done here, we will plot the ratio of <i style='mso-bidi-font-style:
1121normal'>b</i> and <i style='mso-bidi-font-style:normal'>c</i>.</p>
1122
1123<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1124
1125<p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l2 level1 lfo2'><![if !supportLists]><span
1126style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1127mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1128style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1129</span></span></span><![endif]><b style='mso-bidi-font-weight:normal'>Click on
1130the Pseudo <span class=SpellE>Vars</span>/Add</b> menu item to create a new
1131Pseudo Var.</p>
1132
1133<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1134
1135<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
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1138 mso-wrap-style:square'>
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1140</v:shape><![endif]--><![if !vml]><img border=0 width=161 height=48
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1142
1143<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1144
1145<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l2 level1 lfo2'><![if !supportLists]><span
1146style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1147mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1148style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1149</span></span></span><![endif]>A window opens to define a formula</p>
1150
1151<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1152
1153<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
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1161
1162<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1163
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1175src="ParametricFitting_files/image008.png" align=right hspace=9 v:shapes="Picture_x0020_4"><![endif]>In
1176this window, <b style='mso-bidi-font-weight:normal'>type a Python expression, "b/c",</b>
1177but note that the variables <b style='mso-bidi-font-weight:normal'>c</b> and <b
1178style='mso-bidi-font-weight:normal'>b</b> here are arbitrary labels. After
1179entering the formula, <b style='mso-bidi-font-weight:normal'>press the Validate
1180button</b> or wait a few seconds and the validation will be tested
1181automatically. Note that if you pause too long, while typing, an error message
1182may be displayed as the incomplete formula is found to be invalid. If so, make
1183corrections or keep typing until the entire expression is entered. <span
1184style="mso-spacerun:yes">&nbsp;</span>The error message will sometimes show
1185where error is encountered, though not in this case. </p>
1186
1187<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1188
1189<p class=MsoListParagraphCxSpMiddle>When the expression is complete, a new
1190table appears where the arbitrary <b style='mso-bidi-font-weight:normal'>c</b>
1191and <b style='mso-bidi-font-weight:normal'>b</b> labels will be assigned.</p>
1192
1193<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
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1203
1204<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
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1212 text-align:left;margin-left:37.3pt;margin-top:1143.2pt;width:88.5pt;height:65.5pt;
1213 z-index:251659264;visibility:visible;mso-wrap-style:square;
1214 mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
1215 mso-wrap-distance-bottom:0;mso-position-horizontal:right;
1216 mso-position-horizontal-relative:margin;mso-position-vertical:absolute;
1217 mso-position-vertical-relative:margin'>
1218 <v:imagedata src="ParametricFitting_files/image011.png" o:title=""/>
1219 <w:wrap type="square" anchorx="margin" anchory="margin"/>
1220</v:shape><![endif]--><![if !vml]><img width=91 height=68
1221src="ParametricFitting_files/image012.png" align=right hspace=9 v:shapes="Picture_x0020_6"><![endif]>Assign
1222the label for the numerator by <b style='mso-bidi-font-weight:normal'>clicking
1223on the menu button next to label b</b>; this will bring up a list of variable
1224types, from this <b style='mso-bidi-font-weight:normal'>select Phase</b> to
1225bring up a list of phase variables, from that list <b style='mso-bidi-font-weight:
1226normal'>select variable </b><b style='mso-bidi-font-weight:normal'><span
1227style='font-family:Courier'>0<span class=GramE>::</span>b</span>,</b> which is
1228the <i style='mso-bidi-font-style:normal'>b</i> lattice parameter for phase 0
1229(CuCr<sub>2</sub>O<sub>4</sub>). Repeat this process to select <b
1230style='mso-bidi-font-weight:normal'>assign to label c variable </b><b
1231style='mso-bidi-font-weight:normal'><span style='font-family:Courier'>0<span
1232class=GramE>::</span>b</span></b>.</p>
1233
1234<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1235
1236<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1237mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_8" o:spid="_x0000_i1049"
1238 type="#_x0000_t75" style='width:316pt;height:129pt;visibility:visible;
1239 mso-wrap-style:square'>
1240 <v:imagedata src="ParametricFitting_files/image013.png" o:title="" croptop="4597f"
1241  cropbottom="9873f" cropleft="3348f" cropright="3506f"/>
1242</v:shape><![endif]--><![if !vml]><img border=0 width=318 height=131
1243src="ParametricFitting_files/image014.png" v:shapes="Picture_x0020_8"><![endif]></span></p>
1244
1245<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1246
1247<p class=MsoListParagraphCxSpMiddle>As each variable is set, the window shows
1248the value for each variable from the first refinement and when the expression
1249can be evaluated, the value for the expression, evaluated for that first
1250refinement. Only when the expression can be evaluated can the OK button be
1251pressed. </p>
1252
1253<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1254
1255<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1256mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_9" o:spid="_x0000_i1048"
1257 type="#_x0000_t75" style='width:314pt;height:154pt;visibility:visible;
1258 mso-wrap-style:square'>
1259 <v:imagedata src="ParametricFitting_files/image015.png" o:title="" croptop="3770f"
1260  cropbottom="8549f" cropleft="3371f" cropright="3424f"/>
1261</v:shape><![endif]--><![if !vml]><img border=0 width=316 height=156
1262src="ParametricFitting_files/image016.png" v:shapes="Picture_x0020_9"><![endif]></span></p>
1263
1264<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1265
1266<p class=MsoListParagraphCxSpMiddle><b style='mso-bidi-font-weight:normal'>Press
1267OK</b> to close the window and add the Pseudo Var. Note that a new column
1268appears at the end of the sequential refinement data table. </p>
1269
1270<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1271
1272<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1273mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_10" o:spid="_x0000_i1047"
1274 type="#_x0000_t75" style='width:354pt;height:181pt;visibility:visible;
1275 mso-wrap-style:square'>
1276 <v:imagedata src="ParametricFitting_files/image017.png" o:title="" croptop="2743f"
1277  cropbottom="7533f" cropleft="2917f" cropright="3097f"/>
1278</v:shape><![endif]--><![if !vml]><img border=0 width=356 height=183
1279src="ParametricFitting_files/image018.png" v:shapes="Picture_x0020_10"><![endif]></span></p>
1280
1281<p class=MsoListParagraphCxSpMiddle><!--[if gte vml 1]><v:shape id="Picture_x0020_11"
1282 o:spid="_x0000_s1030" type="#_x0000_t75" style='position:absolute;left:0;
1283 text-align:left;margin-left:42.3pt;margin-top:666.2pt;width:93.5pt;height:39pt;
1284 z-index:251660288;visibility:visible;mso-wrap-style:square;
1285 mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
1286 mso-wrap-distance-bottom:0;mso-position-horizontal:right;
1287 mso-position-horizontal-relative:margin;mso-position-vertical:absolute;
1288 mso-position-vertical-relative:margin'>
1289 <v:imagedata src="ParametricFitting_files/image019.png" o:title=""/>
1290 <w:wrap type="square" anchorx="margin" anchory="margin"/>
1291</v:shape><![endif]--><![if !vml]><img width=96 height=41
1292src="ParametricFitting_files/image020.png" align=right hspace=9 v:shapes="Picture_x0020_11"><![endif]>Also
1293note that positioning the mouse above any cell in the table and waiting for a
1294few <span class=GramE>seconds</span> causes the <span class=SpellE>s.u</span>. <span
1295class=GramE>to</span> be shown as a tooltip. </p>
1296
1297<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1298
1299<p class=MsoListParagraphCxSpMiddle><b style='mso-bidi-font-weight:normal'>Double
1300clicking on the column</b> will cause the pseudo <span class=SpellE>var</span> to
1301be plotted:</p>
1302
1303<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1304
1305<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1306mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_12" o:spid="_x0000_i1046"
1307 type="#_x0000_t75" style='width:352pt;height:303pt;visibility:visible;
1308 mso-wrap-style:square'>
1309 <v:imagedata src="ParametricFitting_files/image021.png" o:title="" croptop="2107f"
1310  cropbottom="4939f" cropleft="3133f" cropright="3309f"/>
1311</v:shape><![endif]--><![if !vml]><img border=0 width=354 height=305
1312src="ParametricFitting_files/image022.png" v:shapes="Picture_x0020_12"><![endif]></span></p>
1313
1314<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1315
1316<p class=MsoListParagraphCxSpMiddle><b style='mso-bidi-font-weight:normal'>Press
1317the "s" key</b> inside the plot to <b style='mso-bidi-font-weight:normal'>select
1318Temperature</b> as the x-axis. </p>
1319
1320<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1321
1322<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1323mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_13" o:spid="_x0000_i1045"
1324 type="#_x0000_t75" style='width:163pt;height:156pt;visibility:visible;
1325 mso-wrap-style:square'>
1326 <v:imagedata src="ParametricFitting_files/image023.png" o:title="" croptop="4105f"
1327  cropbottom="8920f" cropleft="6109f" cropright="5911f"/>
1328</v:shape><![endif]--><![if !vml]><img border=0 width=165 height=158
1329src="ParametricFitting_files/image024.png" v:shapes="Picture_x0020_13"><![endif]></span></p>
1330
1331<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1332
1333<p class=MsoListParagraphCxSpMiddle>The plot will then appear as below:</p>
1334
1335<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1336
1337<p class=MsoListParagraphCxSpLast><span style='mso-fareast-language:EN-US;
1338mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_14" o:spid="_x0000_i1044"
1339 type="#_x0000_t75" style='width:353pt;height:304pt;visibility:visible;
1340 mso-wrap-style:square'>
1341 <v:imagedata src="ParametricFitting_files/image025.png" o:title="" croptop="1859f"
1342  cropbottom="5066f" cropleft="3024f" cropright="3203f"/>
1343</v:shape><![endif]--><![if !vml]><img border=0 width=355 height=306
1344src="ParametricFitting_files/image026.png" v:shapes="Picture_x0020_14"><![endif]></span></p>
1345
1346<h2>Step 3: Fitting a simple parametric equation to the unit cell volume</h2>
1347
1348<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1349
1350<p class=MsoNormal>In the next few steps we will fit increasingly sophisticated
1351equations of state to different parameters. As a simple example, we can <b
1352style='mso-bidi-font-weight:normal'>double-click on </b><b style='mso-bidi-font-weight:
1353normal'><span style='font-family:Courier'>0<span class=GramE>::</span><span
1354class=SpellE>Vol</span></span></b>, to plot the unit volume for the first phase
1355vs. T, and fit this to a straight line. <span
1356style="mso-spacerun:yes">&nbsp;</span></p>
1357
1358<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1359
1360<p class=MsoListParagraphCxSpFirst><span style='mso-fareast-language:EN-US;
1361mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_15" o:spid="_x0000_i1043"
1362 type="#_x0000_t75" style='width:356pt;height:305pt;visibility:visible;
1363 mso-wrap-style:square'>
1364 <v:imagedata src="ParametricFitting_files/image027.png" o:title="" croptop="2107f"
1365  cropbottom="4567f" cropleft="3024f" cropright="2769f"/>
1366</v:shape><![endif]--><![if !vml]><img border=0 width=358 height=307
1367src="ParametricFitting_files/image028.png" v:shapes="Picture_x0020_15"><![endif]></span></p>
1368
1369<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><span
1370style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1371mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1372style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1373</span></span></span><![endif]><!--[if gte vml 1]><v:shape id="Picture_x0020_16"
1374 o:spid="_x0000_s1029" type="#_x0000_t75" style='position:absolute;left:0;
1375 text-align:left;margin-left:21.8pt;margin-top:891.2pt;width:73pt;height:53pt;
1376 z-index:251661312;visibility:visible;mso-wrap-style:square;
1377 mso-width-percent:0;mso-height-percent:0;mso-wrap-distance-left:9pt;
1378 mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
1379 mso-wrap-distance-bottom:0;mso-position-horizontal:right;
1380 mso-position-horizontal-relative:margin;mso-position-vertical:absolute;
1381 mso-position-vertical-relative:margin;mso-width-percent:0;
1382 mso-height-percent:0;mso-width-relative:margin;mso-height-relative:margin'>
1383 <v:imagedata src="ParametricFitting_files/image029.png" o:title=""/>
1384 <w:wrap type="square" anchorx="margin" anchory="margin"/>
1385</v:shape><![endif]--><![if !vml]><img width=75 height=55
1386src="ParametricFitting_files/image030.png" align=right hspace=9 v:shapes="Picture_x0020_16"><![endif]><b
1387style='mso-bidi-font-weight:normal'>Click on the Parametric Fit/Add</b> <b
1388style='mso-bidi-font-weight:normal'>equation</b> menu item, which opens a
1389window similar to what was used before to create a Pseudo <span class=SpellE>var</span>,
1390except that here an equation is defined. <span
1391style="mso-spacerun:yes">&nbsp;</span></p>
1392
1393<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1394
1395<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1396mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_17" o:spid="_x0000_i1042"
1397 type="#_x0000_t75" style='width:311pt;height:152pt;visibility:visible;
1398 mso-wrap-style:square'>
1399 <v:imagedata src="ParametricFitting_files/image031.png" o:title="" croptop="4213f"
1400  cropbottom="8982f" cropleft="3490f" cropright="3653f"/>
1401</v:shape><![endif]--><![if !vml]><img border=0 width=313 height=154
1402src="ParametricFitting_files/image032.png" v:shapes="Picture_x0020_17"><![endif]></span></p>
1403
1404<p class=MsoListParagraphCxSpLast><o:p>&nbsp;</o:p></p>
1405
1406<p class=MsoNormal>We will want to fit the unit cell volume to an equation of
1407form <i style='mso-bidi-font-style:normal'>y = <span class=SpellE>mx+b</span></i>,
1408where y will be the volume and x temperature and m and b will be best fit. </p>
1409
1410<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><o:p>&nbsp;</o:p></b></p>
1411
1412<p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><b
1413style='mso-bidi-font-weight:normal'><span style='mso-fareast-font-family:Cambria;
1414mso-fareast-theme-font:minor-latin;mso-bidi-font-family:Cambria;mso-bidi-theme-font:
1415minor-latin'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;
1416</span></span></span></b><![endif]><b style='mso-bidi-font-weight:normal'>Click
1417the menu button</b> to select a dependent variable for "y". From the phase list,
1418select the unit cell volume for the CuCr<sub>2</sub>O<sub>4</sub> phase, <b
1419style='mso-bidi-font-weight:normal'>click on </b><b style='mso-bidi-font-weight:
1420normal'><span style='font-family:Courier'>0<span class=GramE>::</span><span
1421class=SpellE>Vol</span></span></b> and then <b style='mso-bidi-font-weight:
1422normal'>press OK.<o:p></o:p></b></p>
1423
1424<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1425
1426<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1427mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_19" o:spid="_x0000_i1041"
1428 type="#_x0000_t75" style='width:314pt;height:132pt;visibility:visible;
1429 mso-wrap-style:square'>
1430 <v:imagedata src="ParametricFitting_files/image033.png" o:title="" croptop="3830f"
1431  cropbottom="9359f" cropleft="3705f" cropright="3502f"/>
1432</v:shape><![endif]--><![if !vml]><img border=0 width=316 height=134
1433src="ParametricFitting_files/image034.png" v:shapes="Picture_x0020_19"><![endif]></span></p>
1434
1435<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1436mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_20" o:spid="_x0000_i1040"
1437 type="#_x0000_t75" style='width:311pt;height:155pt;visibility:visible;
1438 mso-wrap-style:square'>
1439 <v:imagedata src="ParametricFitting_files/image035.png" o:title="" croptop="3548f"
1440  cropbottom="8549f" cropleft="3611f" cropright="3665f"/>
1441</v:shape><![endif]--><![if !vml]><img border=0 width=313 height=157
1442src="ParametricFitting_files/image036.png" v:shapes="Picture_x0020_20"><![endif]></span></p>
1443
1444<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1445
1446<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><span
1447style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1448mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1449style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1450</span></span></span><![endif]>Now we <b style='mso-bidi-font-weight:normal'>enter
1451the equation</b> using Python syntax, which is simply "<b style='mso-bidi-font-weight:
1452normal'><span style='font-family:Courier'>m*x + b</span></b>", note that the
1453use of spaces and the choice of labels is arbitrary. If one were to accidentally
1454leave out the "<span style='font-family:Courier'>*</span>" and typed "<span
1455style='font-family:Courier'>mx</span>" then that would be considered a label,
1456if "<span style='font-family:Courier'>m x</span>" were typed, an error message
1457would be displayed. </p>
1458
1459<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1460
1461<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1462mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_21" o:spid="_x0000_i1039"
1463 type="#_x0000_t75" style='width:316pt;height:155pt;visibility:visible;
1464 mso-wrap-style:square'>
1465 <v:imagedata src="ParametricFitting_files/image037.png" o:title="" croptop="3326f"
1466  cropbottom="8766f" cropleft="3010f" cropright="3419f"/>
1467</v:shape><![endif]--><![if !vml]><img border=0 width=318 height=157
1468src="ParametricFitting_files/image038.png" v:shapes="Picture_x0020_21"><![endif]></span></p>
1469
1470<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1471
1472<p class=MsoListParagraphCxSpMiddle>Then press Validate or wait a few seconds
1473and a window changes, as above, allowing assignment of the three new labels (m,
1474x, and b). </p>
1475
1476<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1477
1478<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><span
1479style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1480mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1481style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1482</span></span></span><![endif]><!--[if gte vml 1]><v:shape id="Picture_x0020_22"
1483 o:spid="_x0000_s1028" type="#_x0000_t75" style='position:absolute;left:0;
1484 text-align:left;margin-left:43.8pt;margin-top:603.2pt;width:95pt;height:35pt;
1485 z-index:251662336;visibility:visible;mso-wrap-style:square;
1486 mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
1487 mso-wrap-distance-bottom:0;mso-position-horizontal:right;
1488 mso-position-horizontal-relative:margin;mso-position-vertical:absolute;
1489 mso-position-vertical-relative:margin'>
1490 <v:imagedata src="ParametricFitting_files/image039.png" o:title=""/>
1491 <w:wrap type="square" anchorx="margin" anchory="margin"/>
1492</v:shape><![endif]--><![if !vml]><img width=97 height=37
1493src="ParametricFitting_files/image040.png" align=right hspace=9 v:shapes="Picture_x0020_22"><![endif]>Assign
1494b and m as refinable parameters: <b style='mso-bidi-font-weight:normal'>Click
1495on the menu button</b> next to b and <b style='mso-bidi-font-weight:normal'>select
1496Free</b>. Then <b style='mso-bidi-font-weight:normal'>repeat this for m</b>. </p>
1497
1498<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1499mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_23" o:spid="_x0000_i1038"
1500 type="#_x0000_t75" style='width:314pt;height:153pt;visibility:visible;
1501 mso-wrap-style:square'>
1502 <v:imagedata src="ParametricFitting_files/image041.png" o:title="" croptop="3992f"
1503  cropbottom="8541f" cropleft="3250f" cropright="3415f"/>
1504</v:shape><![endif]--><![if !vml]><img border=0 width=316 height=155
1505src="ParametricFitting_files/image042.png" v:shapes="Picture_x0020_23"><![endif]></span></p>
1506
1507<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1508
1509<p class=MsoListParagraphCxSpMiddle>It is not necessary to change the default
1510variable names, the initial values, or the refine flag. </p>
1511
1512<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1513
1514<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><span
1515style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1516mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1517style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1518</span></span></span><![endif]><!--[if gte vml 1]><v:shape id="Picture_x0020_24"
1519 o:spid="_x0000_s1027" type="#_x0000_t75" style='position:absolute;left:0;
1520 text-align:left;margin-left:24.3pt;margin-top:837.2pt;width:75.5pt;height:26pt;
1521 z-index:251663360;visibility:visible;mso-wrap-style:square;
1522 mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
1523 mso-wrap-distance-bottom:0;mso-position-horizontal:right;
1524 mso-position-horizontal-relative:margin;mso-position-vertical:absolute;
1525 mso-position-vertical-relative:margin'>
1526 <v:imagedata src="ParametricFitting_files/image043.png" o:title=""/>
1527 <w:wrap type="square" anchorx="margin" anchory="margin"/>
1528</v:shape><![endif]--><![if !vml]><img width=78 height=28
1529src="ParametricFitting_files/image044.png" align=right hspace=9 v:shapes="Picture_x0020_24"><![endif]>To
1530set x as the temperature, <b style='mso-bidi-font-weight:normal'>click on the
1531menu button</b> next to x, <b style='mso-bidi-font-weight:normal'>select
1532Global,</b> and then <b style='mso-bidi-font-weight:normal'>select Temperature</b>
1533from the list and <b style='mso-bidi-font-weight:normal'>click on OK</b>.</p>
1534
1535<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1536
1537<p class=MsoListParagraphCxSpMiddle><span
1538style="mso-spacerun:yes">&nbsp;</span><span style='mso-fareast-language:EN-US;
1539mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_25" o:spid="_x0000_i1037"
1540 type="#_x0000_t75" style='width:245pt;height:109pt;visibility:visible;
1541 mso-wrap-style:square'>
1542 <v:imagedata src="ParametricFitting_files/image045.png" o:title="" croptop="5483f"
1543  cropbottom="10984f" cropleft="4191f" cropright="4159f"/>
1544</v:shape><![endif]--><![if !vml]><img border=0 width=247 height=111
1545src="ParametricFitting_files/image046.png" v:shapes="Picture_x0020_25"><![endif]></span></p>
1546
1547<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1548
1549<p class=MsoListParagraphCxSpMiddle>The window then changes, showing the values
1550of the dependent variable and the expression for the first refinement, as below.<span
1551style="mso-spacerun:yes">&nbsp; </span>Optionally, the values for m and b could
1552be changed manually and the displayed value will be updated when Validate is
1553pressed or after a short delay.</p>
1554
1555<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1556
1557<p class=MsoListParagraphCxSpLast><span style='mso-fareast-language:EN-US;
1558mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_26" o:spid="_x0000_i1036"
1559 type="#_x0000_t75" style='width:314pt;height:153pt;visibility:visible;
1560 mso-wrap-style:square'>
1561 <v:imagedata src="ParametricFitting_files/image047.png" o:title="" croptop="3992f"
1562  cropbottom="8541f" cropleft="3490f" cropright="3294f"/>
1563</v:shape><![endif]--><![if !vml]><img border=0 width=316 height=155
1564src="ParametricFitting_files/image048.png" v:shapes="Picture_x0020_26"><![endif]></span></p>
1565
1566<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1567
1568<p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><span
1569style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1570mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1571style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1572</span></span></span><![endif]><b style='mso-bidi-font-weight:normal'>Press the
1573OK button</b> to save this parametric fit. The b and m values are then refined
1574and the console shows the results:</p>
1575
1576<p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space:
1577auto'><span style='font-family:Courier'>Fit Results<o:p></o:p></span></p>
1578
1579<p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space:
1580auto'><span style='font-family:Courier'><span
1581style="mso-spacerun:yes">&nbsp;&nbsp; </span><span class=GramE>::</span>m<span
1582style="mso-spacerun:yes">&nbsp; </span>= -0.4476(5)<o:p></o:p></span></p>
1583
1584<p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space:
1585auto'><span style='font-family:Courier'><span
1586style="mso-spacerun:yes">&nbsp;&nbsp; </span><span class=GramE>::</span>b<span
1587style="mso-spacerun:yes">&nbsp; </span>= 577.73(8)<o:p></o:p></span></p>
1588
1589<p class=MsoListParagraphCxSpMiddle style='margin-left:1.5in;mso-add-space:
1590auto'><span style='font-family:Courier'><o:p>&nbsp;</o:p></span></p>
1591
1592<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1593mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_27" o:spid="_x0000_i1035"
1594 type="#_x0000_t75" style='width:350pt;height:302pt;visibility:visible;
1595 mso-wrap-style:square'>
1596 <v:imagedata src="ParametricFitting_files/image049.png" o:title="" croptop="2231f"
1597  cropbottom="5061f" cropleft="3133f" cropright="3524f"/>
1598</v:shape><![endif]--><![if !vml]><img border=0 width=352 height=304
1599src="ParametricFitting_files/image050.png" v:shapes="Picture_x0020_27"><![endif]></span></p>
1600
1601<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1602
1603<p class=MsoListParagraphCxSpMiddle>Also, a plot shows the actual values and
1604the fit. Note that while the values are close to a straight line, the deviations
1605are huge compared to the estimated uncertainty values for the unit cell volume
1606(shown as very small error bars, unless the plot is magnified). <span
1607style="mso-spacerun:yes">&nbsp;</span>If a linear relationship had been defined
1608as a constraint (as can be done with other software packages) <I>the unit cell
1609parameters would have been forced onto this line with no obvious indication
1610that this was not a correct result.</I> </p>
1611
1612<p class=MsoListParagraphCxSpLast><span style="mso-spacerun:yes">&nbsp;</span></p>
1613
1614<h2>Step 4: Examples of more complex fitting equations</h2>
1615
1616<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1617
1618<p class=MsoNormal>Here we will look at how more sophisticated Python capabilities
1619can be used to fit more complex behavior. <span
1620style="mso-spacerun:yes">&nbsp;</span></p>
1621
1622<p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l1 level1 lfo6'><![if !supportLists]><span
1623style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1624mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1625style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1626</span></span></span><![endif]>Optionally <b style='mso-bidi-font-weight:normal'>Double-click
1627on the </b><b style='mso-bidi-font-weight:normal'><span style='font-family:
1628Courier'>0<span class=GramE>::</span>c</span> column</b>. Note the changes in
1629the <i style='mso-bidi-font-style:normal'>c</i> unit cell parameter as a
1630function of temperature, as shown below. </p>
1631
1632<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1633
1634<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1635mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_28" o:spid="_x0000_i1034"
1636 type="#_x0000_t75" style='width:350pt;height:303pt;visibility:visible;
1637 mso-wrap-style:square'>
1638 <v:imagedata src="ParametricFitting_files/image051.png" o:title="" croptop="658f"
1639  cropbottom="2861f" cropleft="1709f" cropright="1878f"/>
1640</v:shape><![endif]--><![if !vml]><img border=0 width=352 height=305
1641src="ParametricFitting_files/image052.png" v:shapes="Picture_x0020_28"><![endif]></span></p>
1642
1643<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1644
1645<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo6'><![if !supportLists]><span
1646style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1647mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1648style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1649</span></span></span><![endif]>We will now fit <i style='mso-bidi-font-style:
1650normal'>c</i> as a function of form 1/(1 + <span class=SpellE><span
1651class=GramE>exp</span></span><span class=GramE>[</span>k(t-t<sub>0</sub>)]). <b
1652style='mso-bidi-font-weight:normal'>Click on the Parametric Fit/Add</b> <b
1653style='mso-bidi-font-weight:normal'>equation</b> menu item (as before). For the
1654dependent variable, <b style='mso-bidi-font-weight:normal'>click on Phase</b>
1655and then <b style='mso-bidi-font-weight:normal'>select </b><b style='mso-bidi-font-weight:
1656normal'><span style='font-family:Courier'>0<span class=GramE>::</span>c</span></b>.
1657<span style="mso-spacerun:yes">&nbsp;</span></p>
1658
1659<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1660
1661<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo6'><![if !supportLists]><span
1662style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1663mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1664style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1665</span></span></span><![endif]>We then <b style='mso-bidi-font-weight:normal'>enter
1666expression</b></p>
1667
1668<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1669
1670<p class=MsoListParagraphCxSpMiddle style='text-indent:.5in'><span class=GramE><span
1671style='font-family:Courier'>b</span></span><span style='font-family:Courier'> +
1672c / (1+math.exp(k*(t-t0)))<o:p></o:p></span></p>
1673
1674<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1675
1676<p class=MsoListParagraphCxSpLast>Note that use of spaces here are arbitrary,
1677but all parentheses are required. Also note that the exponential function [<span
1678class=SpellE><span class=GramE>exp</span></span><span class=GramE>(</span>x) or
1679e<sup>x</sup>] is supplied in Python in the math and <span class=SpellE>numpy</span>
1680modules as <span class=SpellE>math.exp</span>(), <span class=SpellE>numpy.exp</span>().
1681Both of these can be used as well as the convenience abbreviation of <span
1682class=SpellE><span class=GramE>np.exp</span></span><span class=GramE>(</span>).
1683Further, there are also a small number of common functions that are defined
1684without the prefix for convenience [these include pi, <span class=SpellE><span
1685class=GramE>exp</span></span><span class=GramE>(</span>), <span class=SpellE>sqrt</span>(),
1686<span class=SpellE>sind</span>(), <span class=SpellE>cosd</span>(), <span
1687class=SpellE>tand</span>() where d indicates an argument in degrees.]<o:p></o:p></p>
1688
1689<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1690
1691<p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l1 level1 lfo6'><![if !supportLists]><span
1692style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1693mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1694style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1695</span></span></span><![endif]><b style='mso-bidi-font-weight:normal'>Assign
1696free variables to b, c, k and t0</b>, similar as to what was done before. Note
1697that the<b style='mso-bidi-font-weight:normal'> </b>variable name for the <span
1698style='font-family:Courier'>b</span> label was set automatically to <span
1699style='font-family:Courier'>b_1</span>. If the same variable name (<span
1700style='font-family:Courier'>b</span>) <span class=GramE>was</span> used again
1701here, the same value would be used to fit both equations, which is certainly
1702not what we want here. <span style="mso-spacerun:yes">&nbsp;</span>Finally,
1703since this equation is too complex to fit without some reasonable starting
1704values, specify an approximate value for the vicinity of where <i
1705style='mso-bidi-font-style:normal'>c</i> starts to change, <b style='mso-bidi-font-weight:
1706normal'>enter 120 for </b><b style='mso-bidi-font-weight:normal'><span
1707style='font-family:Courier'>t0</span>.</b></p>
1708
1709<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1710
1711<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1712mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_40" o:spid="_x0000_i1033"
1713 type="#_x0000_t75" style='width:317pt;height:171pt;visibility:visible;
1714 mso-wrap-style:square'>
1715 <v:imagedata src="ParametricFitting_files/image053.png" o:title="" croptop="3272f"
1716  cropbottom="7856f" cropleft="3218f" cropright="3436f"/>
1717</v:shape><![endif]--><![if !vml]><img border=0 width=319 height=173
1718src="ParametricFitting_files/image054.png" v:shapes="Picture_x0020_40"><![endif]></span></p>
1719
1720<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1721
1722<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo6'><![if !supportLists]><span
1723style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1724mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1725style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1726</span></span></span><![endif]>Optionally, <b style='mso-bidi-font-weight:normal'>press
1727the Fit button</b> to see if the equation can be refined with starting values
1728of zero for the other three parameters.<span style="mso-spacerun:yes">&nbsp;
1729</span>A fit is obtained and is plotted. </p>
1730
1731<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1732
1733<p class=MsoListParagraphCxSpMiddle><span
1734style="mso-spacerun:yes">&nbsp;</span><span style='mso-fareast-language:EN-US;
1735mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_41" o:spid="_x0000_i1032"
1736 type="#_x0000_t75" style='width:317pt;height:169pt;visibility:visible;
1737 mso-wrap-style:square'>
1738 <v:imagedata src="ParametricFitting_files/image055.png" o:title="" croptop="3477f"
1739  cropbottom="8265f" cropleft="3218f" cropright="3436f"/>
1740</v:shape><![endif]--><![if !vml]><img border=0 width=319 height=171
1741src="ParametricFitting_files/image056.png" v:shapes="Picture_x0020_41"><![endif]></span></p>
1742
1743<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1744
1745<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo6'><![if !supportLists]><span
1746style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1747mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1748style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1749</span></span></span><![endif]><b style='mso-bidi-font-weight:normal'>Press OK</b>
1750to add this equation to the parametric fits and both equations are refit (and
1751if the label for b had not been changed, applying the constraint that b must be
1752the same for both equations.) </p>
1753
1754<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1755
1756<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1757mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_32" o:spid="_x0000_i1031"
1758 type="#_x0000_t75" style='width:353pt;height:301pt;visibility:visible;
1759 mso-wrap-style:square'>
1760 <v:imagedata src="ParametricFitting_files/image057.png" o:title="" croptop="2602f"
1761  cropbottom="4943f" cropleft="3024f" cropright="3097f"/>
1762</v:shape><![endif]--><![if !vml]><img border=0 width=355 height=303
1763src="ParametricFitting_files/image058.png" v:shapes="Picture_x0020_32"><![endif]></span></p>
1764
1765<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1766
1767<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l1 level1 lfo6'><![if !supportLists]><span
1768style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1769mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1770style='mso-list:Ignore'>7.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1771</span></span></span><![endif]>We will now try a more complex equation for the
1772same data, where we set the value to <span style='font-family:Courier'>b</span>
1773for temperatures less than <span style='font-family:Courier'>t0</span> and a critical
1774phenomenon formulism [(t-t<sub>0</sub>)<sup>-a</sup>] for temperatures above <span
1775style='font-family:Courier'>t0</span>. To do this we use the Python syntax "<span
1776style='font-family:Courier'>x1 if <span class=SpellE>testexp</span> else x2</span>"
1777which is <span style='font-family:Courier'>x1</span> where the test expression (<span
1778class=SpellE><span style='font-family:Courier'>testexp</span></span> here) is <span
1779style='font-family:Courier'>True</span> and <span style='font-family:Courier'>x2</span>
1780elsewhere. Thus we can use an expression such as:</p>
1781
1782<p class=MsoListParagraphCxSpMiddle><span
1783style="mso-spacerun:yes">&nbsp;</span></p>
1784
1785<p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space:
1786auto'><span class=GramE><span style='font-family:Courier'>b</span></span><span
1787style='font-family:Courier'> if t &lt;= t0 else b + c * (1-(t-t0)**d)<o:p></o:p></span></p>
1788
1789<p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space:
1790auto'><span style='font-family:Courier'><o:p>&nbsp;</o:p></span></p>
1791
1792<p class=MsoListParagraphCxSpMiddle>This may be easier to read with the
1793inclusion of extra parentheses (that have no effect on the execution):</p>
1794
1795<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1796
1797<p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space:
1798auto'><span class=GramE><span style='font-family:Courier'>b</span></span><span
1799style='font-family:Courier'> if (t &lt;= t0) else (b + c * (1-(t-t0)**d))<o:p></o:p></span></p>
1800
1801<p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space:
1802auto'><span style='font-family:Courier'><o:p>&nbsp;</o:p></span></p>
1803
1804<p class=MsoListParagraphCxSpMiddle>As before, <b style='mso-bidi-font-weight:
1805normal'>add an equation </b>(or edit an existing one), <b style='mso-bidi-font-weight:
1806normal'>set the dependent variable</b> to <span style='font-family:Courier'>0<span
1807class=GramE>::</span>c</span>, <b style='mso-bidi-font-weight:normal'>enter the
1808expression</b> and <b style='mso-bidi-font-weight:normal'>assign the free and
1809fixed variables</b>, as before. <b style='mso-bidi-font-weight:normal'>Set the
1810exponent and the t0</b> values to initial values of -0.025 and 120, respectively,
1811and turn off their refinement flags. Then <b style='mso-bidi-font-weight:normal'>press
1812Fit.</b></p>
1813
1814<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1815mso-no-proof:yes'><o:p>&nbsp;</o:p></span></p>
1816
1817<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1818mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_42" o:spid="_x0000_i1030"
1819 type="#_x0000_t75" style='width:316pt;height:169pt;visibility:visible;
1820 mso-wrap-style:square'>
1821 <v:imagedata src="ParametricFitting_files/image059.png" o:title="" croptop="3691f"
1822  cropbottom="7919f" cropleft="2889f" cropright="3536f"/>
1823</v:shape><![endif]--><![if !vml]><img border=0 width=318 height=171
1824src="ParametricFitting_files/image060.png" v:shapes="Picture_x0020_42"><![endif]></span></p>
1825
1826<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1827
1828<p class=MsoListParagraphCxSpMiddle>Then <b style='mso-bidi-font-weight:normal'>turn
1829refinement of t0 back on</b> and <b style='mso-bidi-font-weight:normal'>press
1830OK</b>. The resulting fit shows the trends quite well: </p>
1831
1832<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1833
1834<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1835mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_35" o:spid="_x0000_i1029"
1836 type="#_x0000_t75" style='width:351pt;height:302pt;visibility:visible;
1837 mso-wrap-style:square'>
1838 <v:imagedata src="ParametricFitting_files/image061.png" o:title="" croptop="2354f"
1839  cropbottom="4937f" cropleft="3349f" cropright="3198f"/>
1840</v:shape><![endif]--><![if !vml]><img border=0 width=353 height=304
1841src="ParametricFitting_files/image062.png" v:shapes="Picture_x0020_35"><![endif]></span></p>
1842
1843<p class=MsoListParagraphCxSpLast><o:p>&nbsp;</o:p></p>
1844
1845<h2>Step 5: Fitting to a Pseudo <span class=SpellE>Var</span></h2>
1846
1847<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1848
1849<p class=MsoNormal>One can fit a function to a pseudo <span class=SpellE>var</span>,
1850just as to a direct variable. If we look at the plot shown in Step 2, it
1851appears there are two regions. We can treat the lower range as a power-law
1852growth, <span class=SpellE>T<sup>k</sup></span>, and the upper region as linear
1853(m*T + b). </p>
1854
1855<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1856
1857<p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l4 level1 lfo7'><![if !supportLists]><span
1858style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1859mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1860style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1861</span></span></span><![endif]>As before, <b style='mso-bidi-font-weight:normal'>add
1862an equation </b>(or edit an existing one). For the dependent variable, <b
1863style='mso-bidi-font-weight:normal'>select Global</b> to bring up that
1864selection of variables and <b style='mso-bidi-font-weight:normal'>select b/c </b>and
1865<b style='mso-bidi-font-weight:normal'>press OK. </b></p>
1866
1867<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1868
1869<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l4 level1 lfo7'><![if !supportLists]><span
1870style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1871mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1872style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1873</span></span></span><![endif]>Then <b style='mso-bidi-font-weight:normal'>enter
1874the equation</b> as </p>
1875
1876<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1877
1878<p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space:
1879auto'><span style='font-family:Courier;mso-bidi-font-family:"Lucida Grande";
1880color:black'>(<span class=GramE>o1</span> + (a1*T)**k) if T &lt; 120 else (o2 +
1881a2*T</span><span style='font-family:Courier'>)<o:p></o:p></span></p>
1882
1883<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1884
1885<p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l4 level1 lfo7'><![if !supportLists]><span
1886style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1887mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1888style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1889</span></span></span><![endif]><b style='mso-bidi-font-weight:normal'>Assign
1890the free and fixed variables</b>, as shown below. Note that the exponent (k) and
1891scaling factor (a1<span class=GramE>),</span> cannot start as zero<b
1892style='mso-bidi-font-weight:normal'>. </b></p>
1893
1894<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1895
1896<p class=MsoListParagraphCxSpLast><span style='mso-fareast-language:EN-US;
1897mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_44" o:spid="_x0000_i1028"
1898 type="#_x0000_t75" style='width:332pt;height:186pt;visibility:visible;
1899 mso-wrap-style:square'>
1900 <v:imagedata src="ParametricFitting_files/image063.png" o:title="" croptop="3190f"
1901  cropbottom="8105f" cropleft="3416f" cropright="3246f"/>
1902</v:shape><![endif]--><![if !vml]><img border=0 width=334 height=188
1903src="ParametricFitting_files/image064.png" v:shapes="Picture_x0020_44"><![endif]></span></p>
1904
1905<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1906
1907<p class=MsoListParagraphCxSpFirst style='text-indent:-.25in;mso-list:l4 level1 lfo7'><![if !supportLists]><span
1908style='mso-fareast-font-family:Cambria;mso-fareast-theme-font:minor-latin;
1909mso-bidi-font-family:Cambria;mso-bidi-theme-font:minor-latin'><span
1910style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;
1911</span></span></span><![endif]><b style='mso-bidi-font-weight:normal'>Press the
1912Fit button</b> and note that all the free variables are adjusted </p>
1913
1914<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1915
1916<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1917mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_45" o:spid="_x0000_i1027"
1918 type="#_x0000_t75" style='width:334pt;height:189pt;visibility:visible;
1919 mso-wrap-style:square'>
1920 <v:imagedata src="ParametricFitting_files/image065.png" o:title="" croptop="2815f"
1921  cropbottom="7542f" cropleft="3074f" cropright="3244f"/>
1922</v:shape><![endif]--><![if !vml]><img border=0 width=336 height=191
1923src="ParametricFitting_files/image066.png" v:shapes="Picture_x0020_45"><![endif]></span><span
1924style="mso-spacerun:yes">&nbsp;</span></p>
1925
1926<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1927
1928<p class=MsoListParagraphCxSpMiddle>Also, that the plotted result is close to the
1929values from the refinement.</p>
1930
1931<p class=MsoListParagraphCxSpMiddle><o:p>&nbsp;</o:p></p>
1932
1933<p class=MsoListParagraphCxSpMiddle><span style='mso-fareast-language:EN-US;
1934mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_48" o:spid="_x0000_i1026"
1935 type="#_x0000_t75" style='width:349pt;height:302pt;visibility:visible;
1936 mso-wrap-style:square'>
1937 <v:imagedata src="ParametricFitting_files/image067.png" o:title="" croptop="2231f"
1938  cropbottom="5061f" cropleft="3350f" cropright="3415f"/>
1939</v:shape><![endif]--><![if !vml]><img border=0 width=351 height=304
1940src="ParametricFitting_files/image068.png" v:shapes="Picture_x0020_48"><![endif]></span></p>
1941
1942<p class=MsoListParagraphCxSpLast><o:p>&nbsp;</o:p></p>
1943
1944<p class=MsoNormal style='margin-left:.25in'><o:p>&nbsp;</o:p></p>
1945
1946<p class=MsoNormal>This completes this tutorial on use of Pseudo <span
1947class=SpellE>Vars</span> and parametric fitting. </p>
1948
1949<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1950
1951<h2>Advanced Use: Externally-Defined Functions</h2>
1952
1953<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1954
1955<p class=MsoNormal>The parametric refinement section of GSAS-II is intended to
1956be quite flexible, but for very complex fitting, a user may wish to define a
1957custom Python function. Such a function can be defined in a separate
1958module that will be accessed with a parametric equation (or pseudo
1959var).</p>
1960
1961<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1962
1963<p class=MsoNormal>As an example of that, if we create a file called
1964<span class=SpellE><span style='font-family:Courier'>fittest.py</span></span>
1965and locate that file in any directory in the Python path (most simply,
1966in the directory where the project file,
1967<span class=SpellE><span
1968style='font-family:Courier'>SeqTut.gpx</span></span>,
1969is located) and place a routine <span class=SpellE><span
1970style='font-family:Courier'>fitfxn</span></span> in that module:</p>
1971
1972<blockquote><blockquote><PRE>
1973# file fittest.py
1974def fitfxn(T,o1,o2,a1,a2,k):
1975    if T < 120:
1976        return o1 + (a1*T)**k
1977    else:
1978        return o2 + a2*T
1979</PRE></blockquote></blockquote>
1980
1981<p class=MsoNormal>The function <span class=SpellE><span style='font-family:
1982Courier'>fittest.fitfxn</span></span> can then be used to duplicate the
1983previous example: </p>
1984
1985<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1986
1987<p class=MsoNormal><span style='mso-fareast-language:EN-US;mso-no-proof:yes'><!--[if gte vml 1]><v:shape
1988 id="Picture_x0020_47" o:spid="_x0000_i1025" type="#_x0000_t75" style='width:315pt;
1989 height:185pt;visibility:visible;mso-wrap-style:square'>
1990 <v:imagedata src="ParametricFitting_files/image070.png" o:title="" croptop="3393f"
1991  cropbottom="7847f" cropleft="3471f" cropright="3290f"/>
1992</v:shape><![endif]--><![if !vml]><img border=0 width=317 height=187
1993src="ParametricFitting_files/image071.png" v:shapes="Picture_x0020_47"><![endif]></span></p>
1994
1995<p class=MsoNormal><o:p>&nbsp;</o:p></p>
1996
1997<p class=MsoNormal>Note that module <span class=SpellE><span style='font-family:
1998Courier'>fittest</span></span> is automatically located and loaded,
1999provided it is found in the path. No changes to the standard
2000distributed GSAS-II code are needed. Care to avoid use of a module name
2001already found in GSAS-II or Python is wise.</p>
2002
2003</div>
2004
2005</body>
2006
2007</html>
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