source: trunk/tutorial2/garnet5.html @ 191

Last change on this file since 191 was 191, checked in by toby, 11 years ago

# on 2000/06/01 16:07:21, toby did:
correct typos

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1<html>
2<head>
3   <META NAME="Author" CONTENT="Brian H. Toby">
4   <title>EXPGUI Tutorial #5</title>
5</head>
6<BODY BGCOLOR="#FFFFFF">
7
8<A HREF=http://www.ncnr.nist.gov>
9<IMG SRC="http://www.ncnr.nist.gov/images/ncnrtrans.gif" 
10alt="Link to NIST Center for Neutron Research home page"
11ALIGN=RIGHT></A>
12<A HREF=http://www.nist.gov>
13<IMG SRC="http://www.ncnr.nist.gov/images/webidblue_2lineright.gif" 
14alt="Link to National Institute of Standards & Technology home page"
15ALIGN=LEFT></A>
16<CENTER>
17<A Href="http://www.ncnr.nist.gov/programs/crystallography/software/tclpkgs.html">
18<IMG SRC="tcltklogo100.gif" 
19alt="Link to Tcl/Tk information">
20</CENTER></A>
21<hr>
22
23<CENTER>
24<H1>EXPGUI Tutorial: Garnet (part 5)</H1>
25</CENTER>
26<H1>
275. Plot data using POWPLOT or LIVEPLOT
28</H1>
29At this point in the GSAS tutorial in the manual,
30program POWPLOT is used to plot the diffraction data. This
31is done by pressing POWPLOT button in the button bar, or
32by pressing the POWPLOT menu item in either the Powder menu
33or the Graphs menu. The input supplied to POWPLOT and the
34results are the same as what is shown in the menu, so this will
35not be shown.
36<P>
37EXPGUI does offer another way to display diffraction data, LIVEPLOT.
38Similar to the way POWPREF was run in the previous step,
39LIVEPLOT can be started by pressing LIVEPLOT button in the button bar,
40or by pressing the LIVEPLOT menu item in the Graphs menu.
41<P>
42<a name="diff">
43<img src="lp1.gif"></a>
44<BR clear=left>
45Since two cycles of refinement have been run,
46LIVEPLOT generates a plot similar to the one above, showing the
47observed data (black X's), simulated (computed) data (red line), the fitted
48background (green line) and the difference between the observed and computed
49data (lower black line),
50<BR clear=left><P>
51<img src="lp2.gif">
52<BR clear=left>
53Note that the region shown in the plot
54can be changed by clicking with the left
55mouse button to outline a region, as shown above.
56When the left mouse button is pressed a second time, the graph is "zoomed in,"
57as is shown below.
58To "zoom out" to the previous region, press the right mouse button.
59<BR clear=left><P>
60<img src="lp3.gif">
61<BR clear=left><P>
62<img src="lp4.gif">
63<BR clear=left>
64Reflection positions can be marked, using the File/Tickmarks menu.
65Likewise, reflection indices can be displayed by pressing the "h" (or "H") key in the
66position of the reflection to be labeled.
67The size and time before
68the reflection labels are removed is determined by values in the Options/HKL labeling menu.
69<BR clear=left><P>
70There are many other options available in LIVEPLOT in the Options menu. The
71Appearance and location of the tickmarks can be set,
72for example, using the "Options/Configure Tickmarks/Auto locate option
73causes the tickmarks to be shown as
74<A HREF="garnet6.html#ticks">small lines under each reflection.</A> 
75The symbol and symbol size
76used for observed data can be selected.
77The X and Y units can be changed to Q or d-space values. Background
78can be subtracted. The legend can be removed from the plot.
79
80<BR clear=left><HR>
81Previous step: <A HREF="garnet4.html">
82Run POWPREF and GENLES</A>
83<BR>
84Next step: <A HREF="garnet6.html">
85Additional Least-Squares Refinement</A>
86
87
88<BR clear=left>
89<HR><p><a href="http://www.ncnr.nist.gov/staff/toby/">Brian Toby</a> (<a href="mailto:brian.toby@nist.gov">Brian.Toby@NIST.GOV</a>)
90<BR clear=left>
91$Revision: 191 $ $Date: 2009-12-04 23:01:55 +0000 (Fri, 04 Dec 2009) $
92</body>
93</html>
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