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74<a href="cmset_op.html">&lt;&lt;prev file</a> | <a href="extrac2.html">next file &gt;&gt;</a>&nbsp;&nbsp;&nbsp;&nbsp;<a href="different.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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90 calculate the different elements of 2 matrix of positive 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="_different">
105
106          <h2><a class="top" href="#container">top</a>different <span class="categories">
107 Calculation
108</span></h2>
109       
110          <p class="header">
111            <span class="result">result = </span>different(<span class="result"><a href="#_different_param_a">a</a>, <a href="#_different_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="_different_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
137               not be sorted. Duplicate elements are ignored, as they have no
138               effect on the result
139</div>
140           
141            <h4 id="_different_param_b">b&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
142              <span class="attr">in</span>
143             
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145              <span class="attr">required</span>
146             
147             
148             
149             
150            </h4>
151       
152          <div class="comments">
153 see a
154</div>
155           
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157         
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159         
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161          <h3>Examples</h3><div class="preformat">
162
163  IDL> a = [2,4,6,8]
164  IDL> b = [6,1,3,2]
165  IDL> different(a,b) = [ 4, 8]         ; Elements in A but not in B
166</div>
167          <h3>Version history</h3>
168         
169          <h4>Version</h4><div class="preformat">
170 $Id: different.pro 325 2007-12-06 10:04:53Z pinsard $
171</div>
172          <h4>History</h4><div class="preformat">
173 <a href="http://www.dfanning.com/tips/set_operations.html"/>
174</div>
175         
176         
177          <h3>Known issues</h3>
178         
179         
180         
181          <h4>Restrictions</h4><div class="preformat">
182 The empty set is denoted by an array with the first element equal to
183 -1.
184
185
186 These functions will not be efficient on sparse sets with wide
187 ranges, as they trade memory for efficiency. The HISTOGRAM function
188 is used, which creates arrays of size equal to the range of the
189 resulting set.
190</div>
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195         
196         
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198         
199       
200          <h3>Statistics</h3>
201          <table class="statistics">
202            <tr><td>McCabe cyclic</td><td>           3</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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