source: trunk/SRC/Documentation/idldoc_assistant_output/Utilities/undefine.html @ 290

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3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
4  <head>
5    <title>undefine.pro (SAXO Documentation Assistant)</title>
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57    <h1><font size="-2">Utilities/</font></h1>
58    <h2>undefine.pro</h2>
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60    <dl>
61    </dl>
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[234]63   
[163]64 erase a variable
[290]65 same thing like <a href="/Applications/rsi/idl_6.3/help/online_help/DELVAR.html">DELVAR</a> but usable in a program and usable
[163]66 for one variable simultaneously
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71     
72      <a name="#_undefine"></a>
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[234]74      <h2>undefine  <font size="-1" color="#006633">
75 Utilities
76</font></h2>
[163]77
78      <p><font face="Courier">undefine<i>, <a href="#_undefine_keyword_varname">varname</a></i></font></p>
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86    <h3>Parameters</h3>
87   
88
89    <a name="#_undefine_keyword_varname"></a>
90    <h4>varname&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
91      <font size="-1" color="#006633">in</font>
92     
93     
94      <font size="-1" color="#006633">required</font>
95     
96     
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99    </h4>
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[234]101   
[163]102 The name of the variable we want erase
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[234]109    <h3>Examples</h3><pre>
[163]110 IDL> a=1
111 IDL> undefine,a
112 % Compiled module: UNDEFINE.
113 IDL> help, a
114 A               UNDEFINED = <Undefined>
115
[234]116    </pre><h3>Version history</h3>
[163]117   
[234]118    <h4>Version</h4>
[290]119 $Id: undefine.pro 260 2007-08-20 15:24:57Z pinsard $
[163]120
[234]121    <h4>History</h4>
122 trouve sur la page web de D.Fanning
123 <a href="http://www.dfanning.com"/> :
124QUESTION: How do I make an IDL variable have a type "undefined"?
[290]125ANSWER: At the main IDL level you can use the IDL procedure <a href="/Applications/rsi/idl_6.3/help/online_help/DELVAR.html">DELVAR</a> to
[163]126delete an IDL variable and make it undefined. Inside of procedures
[290]127and functions, I use this little program named <a href="..//Utilities/undefine.html">undefine</a> that I got
[163]128from Andrew Cool at the DSTO High Frequency Radar Division in
129Adelaide, Australia.
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147    <font size="-3"><p>&nbsp;</p></font>
148    <hr size="1" color="#CCCCCC"/>
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[187]153    <p><font color="gray" size="-3">&nbsp;&nbsp;Produced by IDLdoc 2.0.</font></p>
[163]154
155  </body>
[249]156</html>
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