source: trunk/SRC/Documentation/idldoc_assistant_output/Utilities/undefine.html @ 402

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4  <head>
5    <title>undefine.pro (SAXO Documentation Assistant)</title>
6  </head>
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57    <h1><font size="-2">Utilities/</font></h1>
58    <h2>undefine.pro</h2>
59
60    <dl>
61    </dl>
62
63   
64 erase a variable
65
66 same thing like <a href="/Applications/itt/idl64/help/online_help/DELVAR.html">DELVAR</a> but usable in a program and usable
67 for one variable simultaneously
68
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70   
71
72     
73      <a name="#_undefine"></a>
74
75      <h2>undefine  <font size="-1" color="#006633">
76 Utilities
77</font></h2>
78
79      <p><font face="Courier">undefine<i>, <a href="#_undefine_keyword_varname">varname</a></i></font></p>
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86   
87    <h3>Parameters</h3>
88   
89
90    <a name="#_undefine_keyword_varname"></a>
91    <h4>varname&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
92      <font size="-1" color="#006633">in</font>
93     
94     
95      <font size="-1" color="#006633">required</font>
96     
97     
98     
99     
100    </h4>
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102   
103 The name of the variable we want erase
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110    <h3>Examples</h3><pre>
111   IDL> a=1
112   IDL> undefine,a
113 % Compiled module: UNDEFINE.
114   IDL> help, a
115 A               UNDEFINED = <Undefined>
116
117    </pre><h3>Version history</h3>
118   
119    <h4>Version</h4>
120 $Id: undefine.pro 389 2009-01-27 08:59:35Z smasson $
121
122    <h4>History</h4>
123 trouve sur la page web de D.Fanning
124 <a href="http://www.dfanning.com"/> :
125QUESTION: How do I make an IDL variable have a type "undefined"?
126ANSWER: At the main IDL level you can use the IDL procedure <a href="/Applications/itt/idl64/help/online_help/DELVAR.html">DELVAR</a> to
127delete an IDL variable and make it undefined. Inside of procedures
128and functions, I use this little program named <a href="..//Utilities/undefine.html">undefine</a> that I got
129from Andrew Cool at the DSTO High Frequency Radar Division in
130Adelaide, Australia.
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148    <font size="-3"><p>&nbsp;</p></font>
149    <hr size="1" color="#CCCCCC"/>
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154    <p><font color="gray" size="-3">&nbsp;&nbsp;Produced by IDLdoc 2.0.</font></p>
155
156  </body>
157</html>
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