source: trunk/tutorial1/nickel5.html @ 930

Last change on this file since 930 was 930, checked in by toby, 11 years ago

rcs:* properties removed

  • Property svn:keywords set to Author Date Revision Id
File size: 3.0 KB
Line 
1<html>
2<head>
3   <title>EXPGUI Tutorial #5</title>
4</head>
5
6<style>
7A:link {text-decoration:none}
8A:vlink {text-decoration:none}
9</style>
10
11<BODY BGCOLOR="#FFFFFF"
12      topmargin="0" leftmargin="0" marginwidth="0" marginheight="0" 
13      text="#000000" link="#0033ff" vlink="#0033ff" alink="#0033ff">
14
15<?
16   include("/var/www/include/navigation.inc");
17   include("/var/www/include/utility.inc");
18?>
19<blockquote>
20
21<CENTER>
22<H1>GSAS Nickel example using EXPGUI (part 5)</H1>
23</CENTER>
24<H1>
255. Run POWPREF
26</H1>
27<img src="powpref2.gif" align=left>
28Before a least-squares refinement can be run, the POWPREF program
29must be run. This program assigns the reflections that are associated with
30each data point in each histogram. For this reason, POWPREF should
31be rerun if the lattice constants change, if peak widths or
32asymmetry parameters change or if you change the range of data
33that you are using in any histogram.
34<P>
35POWPREF can be run in one of three ways. It can be invoked from the
36menu item in the Powder menu (see to the left), or as a button in
37the button bar (see below) or by pressing the Alt-P key combination.
38<BR clear=left><P>
39<img src="powpref1.gif">
40<BR>
41<P>
42<img src="powpref3.gif">
43<BR>
44<img src="powpref4.gif" align=left>
45Once POWPREF is started, a window is opened to watch the program
46progress, as is shown above.
47<P>
48The exact behavior of the window after the run completes is somewhat
49system-dependent. In Windows-95 and UNIX you must press the "Enter" or
50"Return" key for the run to complete, but in Windows-NT this is not
51the case. For both versions of Windows, you may or may not need to
52close the window manually once the run is complete, depending on your
53system's settings.
54<P>
55Every time that EXPGUI detects that a change has been made in the .EXP file
56by another program (in this case by POWPREF) this message appears to offer
57to choices: to continue using the previously read file or to reload the
58changed file. If you press the "Continue editing" button, EXPGUI will
59ignore the changes in the .EXP file made by POWPREF, but if you press
60the "Load new", these changes are read and accepted.
61<P>
62In this case press
63"Load new" to use the results of POWPREF. However if a program
64makes changes to the .EXP file that you do not like
65(this is most common with GENLES, when a refinement diverges)
66you can reject the changes by pressing "Continue editing." When the
67.EXP file is later changes and saved, it will overwrite the results in
68the rejected run.
69
70<P><BR>(.EXP Snapshot:
71<A HREF="ftp://ftp.ncnr.nist.gov/pub/cryst/gsas/tutorials/nickel5.exp">
72nickel5.exp
73</A>)
74
75<BR clear=left><HR>
76Previous step: <A HREF="nickel4.html">
77Change a profile parameter
78</A>
79<BR>
80Next step: <A HREF="nickel6.html">
81Plot data using POWPLOT or LIVEPLOT</A>
82
83<HR>
84</blockquote>
85<P><font size=-1><A HREF="MAILTO:crystal@NIST.gov?subject=WWW page <?=$PHP_SELF?>">Comments, corrections or questions: crystal@NIST.gov</A></font><BR>
86<font size=-1><? lastmod(); ?> </font>
87<BR>$Revision: 930 $ $Date: 2009-12-04 23:14:35 +0000 (Fri, 04 Dec 2009) $
88</body>
89</html>
Note: See TracBrowser for help on using the repository browser.