source: trunk/tutorial1/nickel5.html @ 161

Last change on this file since 161 was 161, checked in by toby, 12 years ago

# on 2000/05/26 16:08:48, toby did:
GSAS Nickel tutorial in EXPGUI

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  • Property rcs:date set to 2000/05/26 16:08:48
  • Property rcs:rev set to 1.1
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[161]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>GSAS Nickel example using EXPGUI (part 5)</H1>
25</CENTER>
26<H1>
275. Run POWPREF
28</H1>
29<img src="powpref2.gif" align=left>
30Before a least-squares refinement can be run, the POWPREF program
31must be run. This program assigns the reflections that are associated with
32each data point in each histogram. For this reason, POWPREF should
33be rerun if the lattice constants change, if peak widths or
34asymmetry parameters change or if you change the range of data
35that you are using in any histogram.
36<P>
37POWPREF can be run in one of three ways. It can be invoked from the
38menu item in the Powder menu (see to the left), or as a button in
39the button bar (see below) or by pressing the Alt-P key combination.
40<BR clear=left><P>
41<img src="powpref1.gif">
42<BR>
43<P>
44<img src="powpref3.gif">
45<BR>
46<img src="powpref4.gif" align=left>
47Once POWPREF is started, a window is opened to watch the program
48progress, as is shown above.
49<P>
50Since POWPREF modifies the .EXP file,
51a message, as shown to the left, is displayed.
52Pressing "Load new" causes the new .EXP file to be reread.
53Pressing "Continue editing" causes EXPGUI to continue to edit the
54previous version of the .EXP file. If more changes are made, and
55the .EXP file is saved, the changes made by POWPREF will be lost.
56POWPREF makes only minor changes to the .EXP file, so there
57is little reason to reject the changes, but if a program, such
58as GENLES has made many incorrect changes to an experiment, the
59"Continue editing" option provides an easy way to keep the .EXP file
60from before the run.
61
62<P><BR>(.EXP Snapshot:
63<A HREF="ftp://ftp.ncnr.nist.gov/pub/cryst/gsas/tutorials/nickel5.exp">
64nickel5.exp
65</A>)
66
67<BR clear=left><HR>
68Previous step: <A HREF="nickel4.html">
69Change a profile parameter
70</A>
71<BR>
72Next step: <A HREF="nickel6.html">
73Plot data using POWPLOT or LIVEPLOT</A>
74
75<BR clear=left>
76<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>)
77<BR clear=left>
78$Revision: 161 $ $Date: 2009-12-04 23:01:25 +0000 (Fri, 04 Dec 2009) $
79</body>
80</html>
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