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90 erase a variable
91 same thing like <a href="/Applications/itt/idl64/help/online_help/DELVAR.html">DELVAR</a> but usable in a program and usable
92 for one variable simultaneously
93</div>
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103      <div id="routine_details">
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106        <div class="routine_details" id="_undefine">
107
108          <h2><a class="top" href="#container">top</a>undefine <span class="categories">
109 Utilities
110</span></h2>
111       
112          <p class="header">
113            undefine<span class="result">, <a href="#_undefine_param_varname">varname</a></span></p>
114       
115          <div class="comments">
116</div>
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120         
121            <h3>Parameters</h3>
122       
123           
124            <h4 id="_undefine_param_varname">varname&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
125              <span class="attr">in</span>
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127             
128              <span class="attr">required</span>
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132             
133            </h4>
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135          <div class="comments">
136 The name of the variable we want erase
137</div>
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144          <h3>Examples</h3><div class="preformat">
145 IDL> a=1
146 IDL> undefine,a
147 % Compiled module: UNDEFINE.
148 IDL> help, a
149 A               UNDEFINED = <Undefined>
150</div>
151          <h3>Version history</h3>
152         
153          <h4>Version</h4><div class="preformat">
154 $Id: undefine.pro 325 2007-12-06 10:04:53Z pinsard $
155</div>
156          <h4>History</h4><div class="preformat">
157 trouve sur la page web de D.Fanning
158 <a href="http://www.dfanning.com"/> :
159QUESTION: How do I make an IDL variable have a type "undefined"?
160ANSWER: At the main IDL level you can use the IDL procedure <a href="/Applications/itt/idl64/help/online_help/DELVAR.html">DELVAR</a> to
161delete an IDL variable and make it undefined. Inside of procedures
162and functions, I use this little program named <a href="..//Utilities/undefine.html">undefine</a> that I got
163from Andrew Cool at the DSTO High Frequency Radar Division in
164Adelaide, Australia.
165</div>
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182          <h3>Statistics</h3>
183          <table class="statistics">
184            <tr><td>McCabe cyclic</td><td>           1</td></tr>
185            <tr><td>McCabe essential</td><td>           1</td></tr>
186            <tr><td>McCabe modular design</td><td>           1</td></tr>
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