source: trunk/SRC/Documentation/idldoc_assistant_output/Utilities/undefine.html @ 338

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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 same thing like <a href="/Applications/itt/idl64/help/online_help/DELVAR.html">DELVAR</a> but usable in a program and usable
66 for one variable simultaneously
67
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69   
70
71     
72      <a name="#_undefine"></a>
73
74      <h2>undefine  <font size="-1" color="#006633">
75 Utilities
76</font></h2>
77
78      <p><font face="Courier">undefine<i>, <a href="#_undefine_keyword_varname">varname</a></i></font></p>
79
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85   
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     
97     
98     
99    </h4>
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101   
102 The name of the variable we want erase
103
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109    <h3>Examples</h3><pre>
110 IDL> a=1
111 IDL> undefine,a
112 % Compiled module: UNDEFINE.
113 IDL> help, a
114 A               UNDEFINED = <Undefined>
115
116    </pre><h3>Version history</h3>
117   
118    <h4>Version</h4>
119 $Id: undefine.pro 325 2007-12-06 10:04:53Z pinsard $
120
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"?
125ANSWER: At the main IDL level you can use the IDL procedure <a href="/Applications/itt/idl64/help/online_help/DELVAR.html">DELVAR</a> to
126delete an IDL variable and make it undefined. Inside of procedures
127and functions, I use this little program named <a href="..//Utilities/undefine.html">undefine</a> that I got
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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153    <p><font color="gray" size="-3">&nbsp;&nbsp;Produced by IDLdoc 2.0.</font></p>
154
155  </body>
156</html>
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