source: trunk/doc/expgui5.html

Last change on this file was 1166, checked in by toby, 9 years ago

bring sandbox changes over to main release

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1<html>
2<head>
3   <title>EXPGUI</title>
4   <meta name="keywords" content="crystallography, Rietveld, diffraction,
5   GSAS, EXPGUI">
6</HEAD>
7<style>
8A:link {text-decoration:none}
9A:vlink {text-decoration:none}
10</style>
11
12<BODY BGCOLOR="#FFFFFF"
13      topmargin="0" leftmargin="0" marginwidth="0" marginheight="0" 
14      text="#000000" link="#0033ff" vlink="#0033ff" alink="#0033ff">
15
16<?
17   include("/var/www/include/navigation.inc");
18   include("/var/www/include/utility.inc");
19?>
20<blockquote><font face="arial, helvetica, sans-serif">
21
22<TABLE BORDER BGCOLOR="#FFFF40" ALIGN=RIGHT>
23<TR><TH><A  Href="expgui.html">EXPGUI top</A> 
24</TH><TH><A Href="expgui6.html">Next page</A>
25</TH><TH><A Href="expgui4.html">Previous page</A>
26</TH></TR></TABLE><BR CLEAR=ALL>
27
28<center><h1>
29<HR noshade width="75%" size="2" align="center">
30EXPGUI, part 5
31<HR noshade width="75%" size="2" align="center">
32</h1></center>
33
34<h3>A.5 Profile panel</h3> 
35<DL><DL>
36The Profile panel is used to edit the profile values as well as
37their refinement flags and damping value.
38Note that there will be a set of profile parameters for each
39phase present in each histogram.
40<IMG SRC="new.gif" HEIGHT=13 WIDTH=36 alt="New!">
41The "Change Type" button is used to select a new profile type for one
42or more histogram/phase combinations.
43<P>
44Note that the order that histograms appear in this
45panel is determined by the
46<a href="expguic.html#sorthist">"Sort histograms by"</a> option in
47the Options Menu.
48</DL></DL>
49<img SRC="5.gif" align=TEXTTOP alt="EXPGUI Screen snapshot">
50<DL><DL>
51When more than one phase is present in the histogram,
52the profiles for all phases are shown.
53</DL></DL>
54<img SRC="5a.gif" align=TEXTTOP alt="EXPGUI Screen snapshot">
55<DL><DL>
56<P><I>
57EXPGUI disables the refinement flags for profile terms
58</I>trns<I> or </I>shft<I> 
59when the histogram zero point correction is refined.
60Neophyte users of GSAS sometimes incorrectly attempt to
61refine these terms together, which almost always causes problems.
62(Note that histogram
63</I>Zero<I> is refined for parallel beam diffraction instruments,
64typically synchrotron or neutron diffractometers, while
65</I>trns<I> and </I>shft<I> are
66appropriate only for Bragg-Brentano geometry [typically lab x-ray] instruments.
67In the Bragg-Brentano case, </I>shft<I> 
68is related to the displacement of the
69sample from the scattering plane, which is usually subject to error and thus
70should be refined and </I>trns<I> is a correction for sample transparency,
71which is typically refined only with a low density sample.)
72</I><P>
73If
74<A href="expgui.html#multiplehistogram">
75"Multiple Histogram Selection" mode</A> is set to "All",
76this panel is disabled. For other settings of this mode,
77profile values and settings can be collectively
78modified for groups of histograms and the panel appears slightly
79differently, as is seen below:
80</DL></DL>
81<img SRC="5c.gif" align=TEXTTOP alt="EXPGUI Screen snapshot">
82
83
84<a name="ChangeType">
85<h4>A.5.1 Edit Profile Type</h4> 
86<DL><DL>
87Pressing the "Change Type" button causes a window like the one below to
88be displayed.
89<P><img SRC="5b.gif" align=TEXTTOP alt="EXPGUI Screen snapshot"><BR><P>
90Note that the default profile values are taken from the instrument parameter
91file (in the example above, a profile was selected where no
92such default values were defined and the current values (where appropriate)
93are taken from the current profile function. Through use of the appropriate
94buttons, selected values can be retained from the current profile when
95the function is changed or can be reset to default values. This latter
96capability can be useful even when not changing the profile type, if the
97profile terms have refined into a false minimum.
98
99</DL></DL>
100<a name="GlobalEdit">
101</a><h4>A.5.2 Profile panel</h4> 
102<DL><DL>
103<img SRC="5d.gif" align=TEXTTOP alt="EXPGUI Screen snapshot">
104<P>
105When the button labeled "Global Edit" is pressed
106(<A href="expgui.html#multiplehistogram">
107"Multiple Histogram Selection" mode</A> must be
108set to a single histogram type) the dialog above will be displayed.
109The entry boxes will appear blank
110and only those terms that are filled in will be changed when the "Set"
111button is pressed.
112
113</DL></DL><hr>
114<TABLE BORDER BGCOLOR="#FFFF40" ALIGN=RIGHT>
115<TR><TH><A  Href="expgui.html">EXPGUI top</A> 
116</TH><TH><A Href="expgui6.html">Next page</A>
117</TH><TH><A Href="expgui4.html">Previous page</A>
118</TH></TR></TABLE>
119
120</blockquote>
121</body>
122</html>
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