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74<a href="extrac2.html">&lt;&lt;prev file</a> | <a href="make_selection.html">next file &gt;&gt;</a>&nbsp;&nbsp;&nbsp;&nbsp;<a href="inter.html" target="_TOP">view single page</a> | <a href="./../index.html" target="_TOP">view frames</a>&nbsp;&nbsp;&nbsp;&nbsp;summary: fields | routine&nbsp;&nbsp;&nbsp;&nbsp;details: <a href="#routine_details">routine</a>
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81      <h1 class="directory"><a href="directory-overview.html">Matrix/</a></h1>
82      <h2 class="pro_file">inter.pro</h2>
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85        <dl>
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90 calculate the intersection between 2 matrices of whole numbers
91</div>
92
93     
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99     
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101      <div id="routine_details">
102       
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104        <div class="routine_details" id="_inter">
105
106          <h2><a class="top" href="#container">top</a>inter <span class="categories">
107 Calculation
108</span></h2>
109       
110          <p class="header">
111            <span class="result">result = </span>inter(<span class="result"><a href="#_inter_param_a">a</a>, <a href="#_inter_param_b">b</a></span>)</p>
112       
113          <div class="comments">
114</div>
115
116          <h3>Return value</h3><div class="preformat">
117 tableau
118</div>
119
120         
121            <h3>Parameters</h3>
122       
123           
124            <h4 id="_inter_param_a">a&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
125              <span class="attr">in</span>
126             
127             
128              <span class="attr">required</span>
129             
130             
131             
132             
133            </h4>
134       
135          <div class="comments"> 
136 arrays of positive integers, which need not to be
137 sorted. Duplicate elements are ignored, as they have no effect on the
138 result
139</div>
140           
141            <h4 id="_inter_param_b">b&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
142              <span class="attr">in</span>
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145              <span class="attr">required</span>
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148             
149             
150            </h4>
151       
152          <div class="comments"> 
153 see a
154</div>
155           
156
157         
158
159         
160
161          <h3>Examples</h3><div class="preformat">
162 IDL> a = [2,4,6,8]
163 IDL> b = [6,1,3,2]
164 IDL> inter(a,b) = [ 2, 6]       ; Common elements
165</div>
166          <h3>Version history</h3>
167         
168          <h4>Version</h4><div class="preformat">
169 $Id: inter.pro 325 2007-12-06 10:04:53Z pinsard $
170</div>
171          <h4>History</h4><div class="preformat">
172 <a href="http://www.dfanning.com/tips/set_operations.html"/>
173</div>
174         
175         
176          <h3>Known issues</h3>
177         
178         
179         
180          <h4>Restrictions</h4><div class="preformat"> 
181 The empty set is denoted by an array with the first element equal to
182 -1.
183
184 
185 These functions will not be efficient on sparse sets with wide
186 ranges, as they trade memory for efficiency.
187 The <a href="/Applications/itt/idl64/help/online_help/HISTOGRAM.html">HISTOGRAM</a> function
188 is used, which creates arrays of size equal to the range of the
189 resulting set.
190</div>
191       
192         
193         
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195         
196         
197         
198         
199       
200          <h3>Statistics</h3>
201          <table class="statistics">
202            <tr><td>McCabe cyclic</td><td>           9</td></tr>
203            <tr><td>McCabe essential</td><td>           1</td></tr>
204            <tr><td>McCabe modular design</td><td>           1</td></tr>
205          </table>
206         
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