| 1 | <html> |
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| 2 | <head> |
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| 3 | <META NAME="Author" CONTENT="Brian H. Toby"> |
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| 4 | <title>EXPGUI -- LIVEPLOT/BKGEDIT</title> |
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| 5 | </head> |
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| 6 | <BODY BGCOLOR="#FFFFFF"> |
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| 22 | |
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| 23 | <TABLE BORDER BGCOLOR="#FFFF40" ALIGN=RIGHT> |
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| 24 | <TR><TH><A Href="expgui.html">EXPGUI top</A> |
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| 25 | </TH><TH><A Href="excledt.html">Next page (EXCLEDT)</A> |
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| 26 | </TH><TH><A Href="expguic.html">Previous page</A> |
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| 27 | </TH></TR></TABLE><BR CLEAR=ALL> |
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| 28 | |
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| 29 | |
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| 30 | <center><h1> |
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| 31 | EXPGUI Utilities (1), LIVEPLOT and BKGEDIT |
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| 32 | </h1></center> |
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| 33 | This page documents the LIVEPLOT and BKGEDIT utility programs |
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| 34 | in the EXPGUI package. |
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| 35 | LIVEPLOT and BKGEDIT are actually the same program, but perform |
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| 36 | different functions, depending on how they are invoked. |
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| 37 | LIVEPLOT is used to display the quality of the diffraction fit, while |
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| 38 | BKGEDIT is used to fit a background function to fixed background points |
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| 39 | that have been input by the user. |
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| 40 | <P> |
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| 41 | Both LIVEPLOT and BKGEDIT get the current diffraction information |
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| 42 | by running the TCLDUMP program, if installed, or |
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| 43 | HSTDUMP otherwise. The TCLDUMP program has been optimized for use |
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| 44 | with LIVEPLOT and offers a number of extra |
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| 45 | options that are not available when HSTDUMP is used. Since TCLDUMP has been |
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| 46 | included in GSAS since April of 2000, it is assumed that this is now the case. |
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| 47 | |
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| 48 | <a name="liveplot"></a> |
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| 49 | <H3>LIVEPLOT</H3> |
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| 50 | LIVEPLOT is started by pressing the LIVEPLOT button on the toolbar |
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| 51 | or via the Graphs/liveplot menu item. |
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| 52 | <P> |
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| 53 | Some of the features available in LIVEPLOT are: |
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| 54 | <UL> |
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| 55 | <LI>The plot is updated automatically after each refinement run |
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| 56 | <LI>The plot can be zoomed, by clicking on the corners of the |
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| 57 | area to be magnified. |
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| 58 | <LI> |
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| 59 | The units used for plotting histograms can be selected. Choices are: |
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| 60 | native units (2Theta/TOF/KeV); d-space (A) or Q (A<sup>-1</sup>) |
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| 61 | <LI> |
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| 62 | The background (fixed plus fitted) can be plotted or can be subtracted. |
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| 63 | <LI> |
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| 64 | Reflection tickmarks can be displayed in a variety of formats |
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| 65 | <LI> |
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| 66 | LIVEPLOT can be coupled to the LOGIC or CMPR programs, so that |
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| 67 | peak positions from an ICDD entry or for an arbitrary unit cell and |
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| 68 | spacegroup can be shown superimposed on the "Rietveld plot." |
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| 69 | <LI> |
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| 70 | <IMG SRC="note.gif" alt="Note!"> |
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| 71 | Reflection indices (<I>hkl</I> values) can be shown for tickmarks |
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| 72 | <LI> |
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| 73 | <IMG SRC="new.gif" HEIGHT=13 WIDTH=36 alt="New!"> |
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| 74 | The cumulative chi<sup>2</sup> function can be plotted. |
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| 75 | </UL> |
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| 76 | |
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| 77 | <a name="bkgedit"></a> |
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| 78 | <H3>BKGEDIT</H3> |
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| 79 | <IMG SRC="new.gif" HEIGHT=13 WIDTH=36 alt="New!"> |
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| 80 | For most refinements, it is possible to simply select a background |
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| 81 | function (I find that the type 1 function, |
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| 82 | shifted Chebyschev polynomials, work well) |
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| 83 | and then refine, adding terms until a good fit is obtained. |
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| 84 | On occasion, poor initial fits are obtained in this manner. This is |
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| 85 | most common in cases where large numbers of peaks are poorly fit. Since |
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| 86 | significant sections of the data are not well fit, the refinement results in |
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| 87 | an unreasonable background function, because this yields better agreement |
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| 88 | with the observed data. |
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| 89 | In these cases, |
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| 90 | it may be best to fix the background to follow a "reasonable" curve in the |
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| 91 | initial stages and then refine the background in the final stages of |
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| 92 | refinement, when a good model has been obtained. |
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| 93 | <P> |
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| 94 | The BKGEDIT program, as shown below, is used to input a set a background |
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| 95 | points via the mouse. The points are then used to determine a type 1 |
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| 96 | (Chebyschev) background function that fits the input background points. These |
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| 97 | terms can then be saved in the experiment file creating a background that |
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| 98 | is good enough for the initial stages of refinement and that can be |
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| 99 | refined once the model is adequate for the task. |
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| 100 | <P> |
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| 101 | <IMG SRC="b1.gif" align=TEXTOP alt="BKGEDIT screen image"> |
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| 102 | <H4>Steps in fitting a background function</H4> |
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| 103 | The BKGEDIT program is started from |
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| 104 | via the Powder/bkgedit menu item or by pressing the |
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| 105 | "Fit Background Graphically" button on the |
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| 106 | <A href="expgui3.html#EditBackground">"Edit Background"</A> |
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| 107 | dialog box (invoked from the "Edit Background" button on the |
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| 108 | <A href="expgui3.html">Histogram pane</A>.) |
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| 109 | toolbar |
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| 110 | or |
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| 111 | <OL> |
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| 112 | <LI><a href="#zoom">Zoom in</a> on the lower intensity section of the |
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| 113 | plot, so that the background is clearly discernible. In some cases, the |
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| 114 | data will need to be handled in sections. |
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| 115 | <LI>Press the "Add" button to add background points. |
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| 116 | Note the cursor changes from cross-hairs to an arrow, |
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| 117 | when the "Add" button is pressed. |
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| 118 | <LI>Move the mouse to the first location |
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| 119 | where a background point will be added and click with the left |
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| 120 | mouse button. A magenta triangle will appear at the location. |
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| 121 | Points can be added in any order. It is best to make sure that the fixed points |
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| 122 | are placed over the entire range of the data, e.g. near the maximum and minimum |
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| 123 | data points in TOF, 2theta, etc. |
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| 124 | <DL><DL> |
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| 125 | Note that it is advisable to place many background points in areas where |
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| 126 | the background varies greatly. |
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| 127 | </DL></DL> |
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| 128 | As background points are entered, they are saved in a file named |
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| 129 | <I>EXPNAM</I><tt>.bkg</tt><I>N</I>, where |
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| 130 | <I>EXPNAM</I> is the experiment name and <I>N</I> is the histogram number. |
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| 131 | If BKGEDIT is restarted at some later time, these points are reread. |
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| 132 | <LI>If any points are placed in incorrect positions, they can be deleted by |
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| 133 | pressing the "Delete" button. The mouse cursor changes to a circle. When |
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| 134 | the mouse left clicked, the fixed background point closest to the mouse |
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| 135 | position (which may be outside the zoom range) is deleted. |
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| 136 | <LI>Background points can also be edited by entering numbers into the |
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| 137 | "Background points" area. |
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| 138 | <LI>After enough background points have been entered, the |
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| 139 | "Start Fit" button turns from gray to black. When pressed, the Chebyschev |
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| 140 | polynomial is fitted and the resulting curve is shown as a blue dashed line. |
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| 141 | <DL><DL> |
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| 142 | It is suggested that you start with relatively few |
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| 143 | terms and add terms and background points as needed. |
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| 144 | Note that the maximum number of Chebyschev terms increases as |
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| 145 | more background points are entered. |
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| 146 | </DL></DL> |
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| 147 | The "Improve Fit" button is black when the fit did not |
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| 148 | converge or the number of terms has been changed. "Improve Fit" causes the |
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| 149 | fit to be refined starting from the previous values. |
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| 150 | <LI>Editing the Chebyschev terms is possible. The curve is reevaluated as |
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| 151 | changes are made. |
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| 152 | <LI>Once a good background function is determined, it can be saved in the |
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| 153 | experiment file by pressing the "Save in EXP file & Exit" button. This will |
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| 154 | set the background type to 1, and save the Chebyschev terms. |
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| 155 | It will also turn off |
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| 156 | the background refinement flag for the appropriate histogram so that the |
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| 157 | terms are not refined inadvertently. |
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| 158 | </OL> |
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| 159 | |
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| 160 | <P> |
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| 161 | Note that POWPREF must be run at least once before BKGEDIT can be used, |
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| 162 | however, use of |
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| 163 | GENLES before BKGEDIT is optional. If the data range is changed, for example |
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| 164 | by excluding a section of the data at the lower end, or changing tmax (dmin), |
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| 165 | the Chebyschev polynomial terms must change to generate the same |
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| 166 | background values, so both POWPREF and BKGEDIT should be rerun to |
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| 167 | regenerate the Chebyschev terms. |
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| 168 | |
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| 169 | <H4>Why not use fixed background points?</H4> |
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| 170 | I personally feel that |
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| 171 | a refined background function is preferrable to use of a fixed model, |
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| 172 | if at all possible. |
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| 173 | One reason for this is that Rietveld refinements usually achieve better fits |
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| 174 | when the background is optimized. A second reason refining the background |
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| 175 | provides a |
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| 176 | feel for the interaction between background values and displacement |
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| 177 | (thermal) parameters. |
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| 178 | Usually, background and displacement parameters are fairly independent, but |
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| 179 | for some materials, where the high Q (high 2theta) portion of the pattern |
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| 180 | has many completely overlapped peaks, it is impossible to uniquely |
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| 181 | determine where the |
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| 182 | background should be placed, either by refinement or by manual placement. |
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| 183 | Under these circumstances, the background should be refined with the |
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| 184 | displacement parameters fixed at an appropriate value for the material. The |
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| 185 | background should then be fixed for all future refinements |
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| 186 | and the displacement parameters can then be refined. <I>Of course this |
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| 187 | means you have predjudiced the refinement to result in the expected |
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| 188 | average displacement parameter and this </I><B>must</B><I> be noted |
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| 189 | any publication. However, if this is necessary, the data simply do not |
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| 190 | contain sufficient information to independently determine |
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| 191 | background and displacement parameters. Use of fixed background points |
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| 192 | would not demonstrate this and would lead the researcher to a false |
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| 193 | sense of security (or fear, if the values are unreasonable) |
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| 194 | that the displacement parameters actually mean something.</I> |
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| 195 | <P> |
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| 196 | If you still want to use fixed background points, despite this tirade, |
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| 197 | be sure to set the estimated |
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| 198 | error on those points to be 0.0. Use of non-zero estimated errors, can |
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| 199 | result in artificially lowered R-factors and chi-squared values. |
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| 200 | In one test, I was able to lower the R<sub>wp</sub> and |
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| 201 | reduced chi<sup>2</sup> values, |
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| 202 | from the correct values of 0.042 and 3.0, respectively, to misleading |
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| 203 | values of 0.036 and 0.8, |
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| 204 | respectively. [As expected, the R(F<sup>2</sup>) stayed constant at 0.045; |
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| 205 | FYI, refining the background caused R(F<sup>2</sup>) to drop to 0.036.] |
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| 206 | <P> |
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| 207 | If the background is so truly irregular that only use of fixed background |
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| 208 | points will do, |
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| 209 | BKGEDIT can be used to generate these fixed background points. |
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| 210 | The file used by BKGEDIT to save these points, |
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| 211 | <I>EXPNAM</I><tt>.bkg</tt><I>N</I>, |
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| 212 | can be read into EXPEDT by typing "@R" at the initial prompt |
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| 213 | in EXPEDT: |
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| 214 | <PRE> |
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| 215 | Is this the file you wish to use? (<?>,D,K,Q,R,Y) ><u>@r</u> |
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| 216 | </PRE> |
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| 217 | prompt and then supplying the name of the file, in response to the next prompt: |
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| 218 | <PRE> |
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| 219 | Enter the name of your macro file: <u>GARNET.bkg1</u> |
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| 220 | </PRE> |
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| 221 | And this will enter the background points entered into BKGEDIT as GSAS |
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| 222 | fixed background points. If you do this you do not want to fit and enter |
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| 223 | Note that you are allowed to use both fixed and a refined background together, |
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| 224 | though this is seldom done. |
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| 225 | |
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| 226 | <hr><h2>LIVEPLOT/BKGEDIT Features</h2> |
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| 227 | <a name="zoom"></a> |
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| 228 | <B>Plot zooming</B> |
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| 229 | When the left (usual) mouse button is pressed, this defines one corner |
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| 230 | of a region to be magnified, as is shown to the right. |
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| 231 | If the mouse is then moved, the diagonal |
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| 232 | corner of this magnification region is defined. When the left mouse button |
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| 233 | is pressed a second time, the selected section of the plot is magnified to |
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| 234 | fill the entire plot. |
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| 235 | <P> |
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| 236 | Zoom settings are saved. |
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| 237 | If the right mouse button is pressed, the previous zoom setting is used, |
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| 238 | so that the left mouse button is used to "zoom in" and the right mouse |
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| 239 | button is used to "zoom out." |
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| 240 | |
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| 241 | <P> |
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| 242 | <h2>Features in LIVEPLOT only</h2> |
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| 243 | <img SRC="lz.gif" BORDER=3 align=RIGHT alt="EXPGUI Screen snapshot"> |
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| 244 | <B>The cumulative chi<sup>2</sup></B> |
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| 245 | function was first suggested by |
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| 246 | Bill David as a way to see which reflections have the greatest influence on |
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| 247 | chi<sup>2</sup> [W.I.F. David, <I>Accuracy in Powder Diffraction-III</I>, 2001]. |
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| 248 | It is defined for point j as |
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| 249 | <IMG SRC="cchi2.gif" alt="equation for cumulative chi2 function" ALIGN=TOP> |
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| 250 | where y<sub>obs,i</sub> and y<sub>calc,i</sub> are the observed and computed |
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| 251 | data points and sigma<sub>i</sub> is the expected error. Thus, the statistically |
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| 252 | expected value for |
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| 253 | [(y<sub>obs,i</sub>-y<sub>calc,i</sub>)/sigma<sub>i</sub>]<sup>2</sup> is 1 |
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| 254 | and this function should rise in a smooth line if all points are fitted as |
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| 255 | statistically expected. |
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| 256 | <P> |
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| 257 | In the plot to the right, the cumulative chi<sup>2</sup> function is shown in |
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| 258 | purple. Note that first peak is not well fit, but the low angle "shoulder" is |
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| 259 | as important as the peak misfitting, with respect to the chi<sup>2</sup>. |
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| 260 | <br clear=all> |
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| 261 | <P> |
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| 262 | <img SRC="lind.gif" BORDER=3 align=RIGHT alt="EXPGUI Screen snapshot"> |
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| 263 | <B>Reflection indices</B> |
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| 264 | are be displayed by pressing "H" or "h" while the |
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| 265 | mouse is near a reflection (holding the shift key while |
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| 266 | pressing the left mouse button also works). The indices are shown |
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| 267 | on the screen for phases with tickmarks (as shown to the right). |
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| 268 | Indices are listed in the "Separate window for <I>hkl</I> labels" |
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| 269 | (as seen below) for all phases, regardless of the tickmark settings. |
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| 270 | Displayed indices will remain on the screen for a preset time and |
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| 271 | then will be deleted, unless the labeling options are changed. |
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| 272 | <img SRC="lind1.gif" align=LEFT alt="EXPGUI Screen snapshot"> |
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| 273 | <P> |
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| 274 | <br clear=all> |
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| 275 | |
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| 276 | <hr><h2>LIVEPLOT/BKGEDIT Menu Contents</h2> |
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| 277 | A few of these options are omitted from BKGEDIT. |
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| 278 | <DL><DL> |
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| 279 | <img SRC="lm1.gif" align=RIGHT alt="EXPGUI Screen snapshot"> |
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| 280 | <H3>File Menu</H3> |
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| 281 | <DT>Tickmarks |
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| 282 | <DD>Checkbuttons are provided for each phase to determine if tick marks |
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| 283 | are shown. See the Options/"Configure Tickmarks"menu item for information |
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| 284 | on tickmarks |
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| 285 | <DT>Histogram |
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| 286 | <DD>This allows a histogram to be selected to be loaded |
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| 287 | <DT>Update Plot |
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| 288 | <DD>The causes LIVEPLOT to read read the current histogram again from |
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| 289 | the datafile |
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| 290 | <DT>Make PostScript |
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| 291 | <DD>Creates a low quality PostScript file containing the LIVEPLOT |
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| 292 | output. See the Options/"Set PS output" button for where the file is created. |
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| 293 | <DT>Quit |
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| 294 | <DD>Exits BKGEDIT/LIVEPLOT. |
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| 295 | </DL></DL> |
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| 296 | <br clear=all> |
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| 297 | <img SRC="lm2.gif" align=RIGHT alt="EXPGUI Screen snapshot"> |
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| 298 | <H3>Options Menu</H3> |
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| 299 | <DL><DL> |
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| 300 | <DT>Configure Tickmarks |
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| 301 | <DD>Tickmarks can be placed automatically, similar to their |
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| 302 | placement in POWPLOT or can be drawn one height to another. The default |
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| 303 | is for lines to be draw from "-Inf" to "Inf", which creates lines from the |
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| 304 | bottom to the top of the plot. The options for each phase allow the line to be changed between solid and dashed, color of the line can be specified and |
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| 305 | the vertical placement of the tickmarks can be specified. The "show" flag, |
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| 306 | set in the File/Tickmarks menu can also be changed here. |
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| 307 | <DT>Obs Symbol (Symbol Type) |
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| 308 | <DD>This brings up a menu where the symbol type and size for the |
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| 309 | observed data points (and for BKGEDIT, the fixed background points) |
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| 310 | can be selected. |
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| 311 | <DT>Symbol Color |
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| 312 | <DD>The colors for all the displayed lines and symbols can be changed here. |
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| 313 | <DT>X units |
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| 314 | <DD>The x units can be selected here. The choices are |
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| 315 | "as collected" (2Theta/TOF/KeV), d-space (A) or Q (A<sup>-1</sup>) |
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| 316 | <DT>Y units |
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| 317 | <DD>The intensity values can be normalized by the incident spectrum |
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| 318 | (for energy dispersive methods). |
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| 319 | <DT>HKL labeling |
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| 320 | <DD>This brings up a menu that selects how long <I>hkl</I> values are shown |
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| 321 | before they are erased (0 means that they are not erased), the size of the |
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| 322 | labels and the width around the mouse that is searched for matching |
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| 323 | reflections. If requested using the "Separate window for <I>hkl</I> labels" |
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| 324 | option, labels are also show in a separate window. |
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| 325 | <DT>Subtract background |
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| 326 | <DD>The background is always shown, even when subtracted |
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| 327 | <DT>Include legend |
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| 328 | <DD>The legend is the optional box in the upper left that defines the |
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| 329 | plot entries |
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| 330 | <DT>Set PS output |
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| 331 | <DD>For UNIX this allows the file to be sent directly to a printer |
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| 332 | or can be saved in a file. For Windows, a file must be written. |
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| 333 | <DT>Set screen font |
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| 334 | <DD>This option is used to control the font used for menus, graphics and |
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| 335 | other aspects of windows. |
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| 336 | <DT>Raise on update |
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| 337 | <DD>This causes the plot to be placed on top of other windows, if partially |
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| 338 | obscured, when the plot is updated. At this time, this option does not |
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| 339 | work in Windows-NT and -2000. |
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| 340 | <DT>Cumulative Chi2 |
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| 341 | <DD>The causes the Cumulative chi<sup>2</sup> function to be defined |
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| 342 | (see below). |
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| 343 | <DT>Save Options |
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| 344 | <DD>Causes many of the options set in this menu to be saved in the <TT>.gsas_config</TT> file. |
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| 345 | </DL></DL> |
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| 346 | <br clear=all> |
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| 347 | |
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| 348 | <P> |
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| 349 | <hr><H2>Customization of LIVEPLOT & BKGEDIT</H2><A NAME="customize"></A> |
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| 350 | The <TT>localconfig</TT> and <TT>.gsas_config</TT> files are read, if present. |
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| 351 | The following variables control how LIVEPLOT, and in most cases BKGEDIT, |
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| 352 | function and can be |
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| 353 | customized by changing their values in the |
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| 354 | <TT>localconfig</TT> and <TT>.gsas_config</TT> files. |
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| 355 | Note that some of these options are relevant only if the tcldump program is |
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| 356 | present. |
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| 357 | <DL><DL> |
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| 358 | <DT><TT>peakinfo(flag<i>n</i>)</TT><DD> |
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| 359 | These variables define if peak positions will be shown |
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| 360 | for reflections in phase "<i>n</i>". Reflections will be shown if |
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| 361 | the value is non-zero. |
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| 362 | |
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| 363 | <DT><TT>peakinfo(color<i>n</i>)</TT><DD> |
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| 364 | These variables define the default colors for |
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| 365 | reflections in phase "<i>n</i>" |
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| 366 | |
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| 367 | <DT><TT>peakinfo(dashes<i>n</i>)</TT><DD> |
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| 368 | These variables define if peaks will be dashed for |
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| 369 | reflections in phase "<i>n</i>" (UNIX only). Lines will be dashed if |
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| 370 | the value is non-zero. |
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| 371 | |
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| 372 | <DT><TT>peakinfo(min<i>n</i>) and peakinfo(max<i>n</i>)</TT><DD> |
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| 373 | These variables dictate the placement vertical position for reflection |
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| 374 | markers, when manually placed (see expgui(autotick), below). To draw |
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| 375 | to the edge of the screen, use -Inf and Inf. |
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| 376 | </DL></DL> |
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| 377 | |
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| 378 | The following variables are written to <tt>.gsas_config</tt> when |
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| 379 | "Save Options" is used. These variables are all set from the GUI and therefore |
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| 380 | do not need to be edited manually. |
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| 381 | |
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| 382 | <DL><DL> |
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| 383 | <DT><TT>graph(printout)</TT><DD> |
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| 384 | This is set to 1 if PostScript files |
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| 385 | will be printed and 0 if they will be written to disk (for Windows all |
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| 386 | files should be written to disk). |
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| 387 | |
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| 388 | <DT><TT>graph(outname)</TT><DD> |
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| 389 | This is the default for the file name used |
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| 390 | when PostScript files will be written to disk. |
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| 391 | |
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| 392 | <DT><TT>graph(outcmd)</TT><DD> |
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| 393 | This is the default for the command used |
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| 394 | to print PostScript files (Unix only). |
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| 395 | |
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| 396 | <DT><TT>graph(legend)</TT><DD> |
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| 397 | Sets the default value for display of the legend in LIVEPLOT and WIDPLT. |
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| 398 | |
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| 399 | <DT><TT>graph(autoraise)</TT><DD> |
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| 400 | This option shows up in the options menu item as "Raise on update." |
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| 401 | When set to non-zero, the LIVEPLOT window is raised |
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| 402 | (placed on top of any other overlapping) windows |
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| 403 | each time it is updated. |
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| 404 | This option does not seem to work in Windows-NT, but this may depend on |
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| 405 | the version of Tcl/Tk. |
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| 406 | |
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| 407 | <DT><TT>peakinfo(obssym)</TT><DD> |
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| 408 | Symbol for observed data points. Valid choices are square, circle, diamond, |
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| 409 | plus, cross, splus and scross. |
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| 410 | |
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| 411 | <DT><TT>peakinfo(obssize)</TT><DD> |
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| 412 | Size for the symbol for observed data points. A value of 1 corresponds to about 1/8 inch |
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| 413 | (about 3 mm). |
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| 414 | |
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| 415 | <DT><TT>expgui(pixelregion)</TT><DD> |
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| 416 | When hkl values are loaded (using tcldump) and reflections are labeled, reflections |
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| 417 | can be labeled using a Shift-Left-Mouse click. All labeled reflections within expgui(pixelregion) |
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| 418 | pixels of the mouse position are assumed to be overlapped and are labeled. |
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| 419 | |
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| 420 | <DT><TT>expgui(fadetime)</TT><DD> |
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| 421 | The time in seconds before reflection labels are removed. A value of zero means that reflections |
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| 422 | must be deleted manually (Shift-Right-Mouse). |
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| 423 | |
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| 424 | <DT><TT>expgui(lblfontsize)</TT><DD> |
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| 425 | A size for reflections labels in pixels. |
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| 426 | |
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| 427 | <DT><TT>expgui(hklbox)</TT><DD> |
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| 428 | If this variable is non-zero, reflection indices are shown in a box. |
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| 429 | |
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| 430 | <DT><TT>expgui(autotick)</TT><DD> |
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| 431 | If this variable is non-zero, reflection markers positions are |
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| 432 | set automatically. |
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| 433 | </DL></DL> |
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| 434 | <P> |
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| 435 | <hr><H2>Installation details/External Programs</H2> |
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| 436 | <B>Using TCLDUMP with LIVEPLOT.</B> |
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| 437 | LIVEPLOT works with the standard GSAS program HSTDMP, but it works faster and is more |
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| 438 | powerful when used with the TCLDUMP program. |
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| 439 | Note that as of the April 2000 releases, GSAS is now distributed with TCLDUMP |
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| 440 | included. For older versions of GSAS, note the |
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| 441 | instructions for downloading this file can in the installation notes for |
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| 442 | <A HREF="expgui_Win_readme.html"> |
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| 443 | Windows</A> and |
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| 444 | <A HREF="expgui_Unix_readme.html"> |
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| 445 | UNIX</A>. |
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| 446 | <P> |
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| 447 | |
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| 448 | <B>Combining CMPR and LIVEPLOT.</B> |
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| 449 | If you have <A HREF="http://www.ncnr.nist.gov/programs/crystallography/software/cmpr.html">CMPR</A> |
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| 450 | installed on your computer, you can use superimpose on the GSAS results |
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| 451 | the peaks for an arbitrary unit cell. If desired, space group extinctions |
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| 452 | can even be shown. |
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| 453 | This is pretty neat! To enable this feature, you must have a version |
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| 454 | of CMPR downloaded after 4 May 1998 |
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| 455 | <A HREF="http://www.ncnr.nist.gov/programs/crystallography/software/cmpr.html"> |
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| 456 | (see the CMPR installation instructions.)</A> |
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| 457 | <UL><LI> |
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| 458 | For UNIX, create a link from in the EXPGUI |
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| 459 | directory to file cellgen.tcl in the CMPR directory. For example: |
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| 460 | <PRE> |
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| 461 | ln -s /usr/local/cmpr/cellgen.tcl /usr/local/gsas/expgui/cellgen.tcl |
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| 462 | </PRE> |
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| 463 | <LI>For Windows, copy all the .tcl and .exe files from the CMPR directory |
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| 464 | into the EXPGUI directory. |
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| 465 | </UL> |
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| 466 | <P> |
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| 467 | |
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| 468 | <B>Combining LOGIC and LIVEPLOT.</B> |
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| 469 | If you have <A HREF="http://www.ncnr.nist.gov/programs/crystallography/software/logic.html">LOGIC</A> |
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| 470 | installed on your computer, you can superimpose peaks |
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| 471 | for a entry from the ICDD/JCPDS database on a pattern in LIVEPLOT. |
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| 472 | This is also pretty neat! |
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| 473 | To enable this feature, you must have |
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| 474 | a version of LOGIC downloaded after 4 May 1998 |
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| 475 | <A HREF="http://www.ncnr.nist.gov/programs/crystallography/software/logic.html"> |
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| 476 | (see the LOGIC installation instructions.)</A> |
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| 477 | <UL><LI> |
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| 478 | For UNIX, create a link from in the GSAS GUI |
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| 479 | directory to file icddcmd.tcl in the LOGIC directory. For example: |
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| 480 | <PRE> |
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| 481 | ln -s /usr/local/powdersuite/icddcmd.tcl /usr/local/gsas/expgui/icddcmd.tcl |
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| 482 | </PRE> |
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| 483 | <LI>For Windows, copy all the LOGIC files into the EXPGUI directory. |
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| 484 | </UL> |
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| 485 | <hr> |
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| 486 | <TABLE BORDER BGCOLOR="#FFFF40" ALIGN=RIGHT> |
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| 487 | <TR><TH><A Href="expgui.html">EXPGUI top</A> |
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| 488 | </TH><TH><A Href="excledt.html">Next page (EXCLEDT)</A> |
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| 489 | </TH><TH><A Href="expguic.html">Previous page</A> |
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| 490 | </TH></TR></TABLE><BR CLEAR=ALL> |
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| 491 | |
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| 492 | <a href="http://www.ncnr.nist.gov/staff/toby/">Brian Toby</a> (<a href="mailto:brian.toby@nist.gov">Brian.Toby@NIST.GOV</a>) |
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| 493 | <br> |
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| 494 | $Revision: 439 $ $Date: 2009-12-04 23:06:11 +0000 (Fri, 04 Dec 2009) $ |
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| 495 | </body> |
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| 496 | </html> |
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