Changeset 209


Ignore:
Timestamp:
Dec 4, 2009 5:02:13 PM (11 years ago)
Author:
toby
Message:

# on 2000/06/09 03:57:42, toby did:
incorporate many useful comments by Egbert Keller

File:
1 edited

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  • trunk/tutorial1/nickel6.html

    • Property rcs:date changed from 2000/06/01 16:07:21 to 2000/06/09 03:57:42
    • Property rcs:lines changed from +2 -2 to +41 -7
    • Property rcs:rev changed from 1.2 to 1.3
    r186 r209  
    27276. Plot data using POWPLOT or LIVEPLOT
    2828</H1>
    29 At this point in the GSAS tutorial in the manual,
     29At this point in the GSAS tutorial
    3030program POWPLOT is used to plot the diffraction data. This
    31 is done by pressing POWPLOT button in the button bar, or
     31is done in EXPGUI by pressing POWPLOT button in the button bar, or
    3232by pressing the POWPLOT menu item in either the Powder menu
    3333or the Graphs menu. The input supplied to POWPLOT and the
    3434results are the same as what is shown in the menu, so this will
    35 not be shown.
     35not be repeated here.
    3636<P>
    3737EXPGUI does offer another way to display diffraction data, LIVEPLOT.
     
    4242<img src="liveplot1.gif" align=left>
    4343Since no cycles of refinement have been run,
    44 after LIVEPLOT generates a blank screen, it must be
     44after LIVEPLOT has generated a blank window, it must be
    4545triggered to read the POWPREF output by pressing the "Update Plot"
    4646item in the File menu.
    47 A plot similar to the one to the left.
     47A plot similar to the one to the left is then displayed.
     48<P>
     49The contents of the LIVEPLOT window are discussed more fully
     50<A HREF="#liveplot">
     51below</A>, but
     52note that the calculated diffraction intensities are all
     53zero at this point, since GENLES
     54has not yet been to run to simulate the pattern.
     55Likewise the background values have not yet been fit so
     56this curve is a poor fit.
     57The blue line shows the values of
     58obs-calc (diff), offset negatively. The sum of the fixed background
     59values plus the fitted background function is shown
     60difference
     61pattern is
    4862<BR clear=left><P>
    4963<img src="liveplot2.gif" align=left>
    5064Note that the region plotted can be changed by clicking with the left
    51 mouse button, two outline the region to be shown, as seen to the left.
     65mouse button, to outline the region to be shown, as seen to the left.
    5266When the left mouse button is pressed a second time, the graph is "zoomed in,"
    5367as is shown below.
     
    6478the reflection labels are removed is determined by values in the Options/HKL labeling menu.
    6579<BR clear=left><P>
     80<I>Do not exit LIVEPLOT at this time as it will be used again in part 8 of this
     81tutorial.</I>
     82<a name="liveplot">
     83<H4>LIVEPLOT Contents and Options</H1>
     84</a>
     85Note that the observed data points (obs) are marked with "x" symbols in
     86LIVEPLOT.
     87This can be changed in the Options/Obs symbol menu. The simulated
     88diffraction data based on the crystallographic model (calc) is shown as
     89a red line. The lower blue line shows the values of
     90obs-calc (diff), offset negatively to avoid overlapping with the previous
     91curves. The green line (mostly obscured in this figure) shows the background
     92function (bckg). This is the sum of the fixed background
     93values (if any) plus the fitted background function (if used).
     94The dashed magenta vertical lines denote reflection positions. The color
     95and lengths of these lines can be customized using the
     96options/Configure Tickmarks menu item, for example, auto placement mode
     97creates the more customary short tickmarks placed below the pattern,
     98at different heights when more than one phase is present.
     99<P>
    66100There are many other options available in LIVEPLOT in the Options menu. The
    67101Appearance and location of the tickmarks can be set. The symbol and symbol size
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