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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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90 calculate the intersection between 2 matrices of whole numbers
91</div>
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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"> tableau
117</div>
118
119         
120            <h3>Parameters</h3>
121       
122           
123            <h4 id="_inter_param_a">a&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
124              <span class="attr">in</span>
125             
126             
127              <span class="attr">required</span>
128             
129             
130             
131             
132            </h4>
133       
134          <div class="comments"> arrays of positive integers, which need not to be
135 sorted. Duplicate elements are ignored, as they have no effect on the
136 result
137</div>
138           
139            <h4 id="_inter_param_b">b&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
140              <span class="attr">in</span>
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142             
143              <span class="attr">required</span>
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145             
146             
147             
148            </h4>
149       
150          <div class="comments"> see a
151</div>
152           
153
154         
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156         
157
158          <h3>Examples</h3><div class="preformat">  a = [2,4,6,8]
159   b = [6,1,3,2]
160   inter(a,b) = [ 2, 6]       ; Common elements
161</div>
162          <h3>Version history</h3>
163         
164          <h4>Version</h4><div class="preformat"> $Id: inter.pro 163 2006-08-29 12:59:46Z navarro $
165</div>
166          <h4>History</h4><div class="preformat">  http://www.dfanning.com/tips/set_operations.html
167</div>
168         
169         
170          <h3>Known issues</h3>
171         
172         
173         
174          <h4>Restrictions</h4><div class="preformat"> The empty set is denoted by an array with the first element equal to
175 -1.
176
177 These functions will not be efficient on sparse sets with wide
178 ranges, as they trade memory for efficiency. The HISTOGRAM function
179 is used, which creates arrays of size equal to the range of the
180 resulting set.
181</div>
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190       
191          <h3>Statistics</h3>
192          <table class="statistics">
193            <tr><td>McCabe cyclic</td><td>           9</td></tr>
194            <tr><td>McCabe essential</td><td>           1</td></tr>
195            <tr><td>McCabe modular design</td><td>           1</td></tr>
196          </table>
197         
198       
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