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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 find the different elements of 2 matrixes of positive whole numbers.
91
92 see also <a href="..//Matrix/union.html">union</a> and <a href="..//Matrix/inter.html">inter</a>.
93</div>
94
95     
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101     
102
103      <div id="routine_details">
104       
105
106        <div class="routine_details" id="_different">
107
108          <h2><a class="top" href="#container">top</a>different <span class="categories">
109 Calculation
110</span></h2>
111       
112          <p class="header">
113            <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>
114       
115          <div class="comments">
116</div>
117
118          <h3>Return value</h3><div class="preformat">
119 an array containing the set of values in only a.
120
121 The empty set is denoted by an array with the first element equal to
122 -1.
123</div>
124
125         
126            <h3>Parameters</h3>
127       
128           
129            <h4 id="_different_param_a">a&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
130              <span class="attr">in</span>
131             
132             
133              <span class="attr">required</span>
134             
135             
136             
137             
138            </h4>
139       
140          <div class="comments">
141 arrays of positive integers, which need
142 not be sorted. Duplicate elements are ignored, as they have no
143 effect on the result
144</div>
145           
146            <h4 id="_different_param_b">b&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
147              <span class="attr">in</span>
148             
149             
150              <span class="attr">required</span>
151             
152             
153             
154             
155            </h4>
156       
157          <div class="comments">
158 see a
159</div>
160           
161
162         
163
164         
165
166          <h3>Examples</h3><div class="preformat">
167
168   IDL> a = [2,4,6,8]
169   IDL> b = [6,1,3,2]
170
171   IDL> res=different(a,b)
172              4           8
173 Right because 4 and 8 are in a but not in b !
174
175   IDL> res=different(b,a)
176   IDL> print,res
177              1           3
178
179 Right because 1 and 3 are in b but not in a !
180</div>
181          <h3>Version history</h3>
182         
183          <h4>Version</h4><div class="preformat">
184 $Id: different.pro 373 2008-08-08 14:11:31Z pinsard $
185</div>
186          <h4>History</h4><div class="preformat">
187 <a href="http://www.dfanning.com/tips/set_operations.html"/>
188</div>
189         
190         
191          <h3>Known issues</h3>
192         
193         
194         
195          <h4>Restrictions</h4><div class="preformat">
196 These functions will not be efficient on sparse sets with wide
197 ranges, as they trade memory for efficiency. The HISTOGRAM function
198 is used, which creates arrays of size equal to the range of the
199 resulting set.
200</div>
201       
202         
203         
204         
205         
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208         
209       
210          <h3>Statistics</h3>
211          <table class="statistics">
212            <tr><td>McCabe cyclic</td><td>           3</td></tr>
213            <tr><td>McCabe essential</td><td>           1</td></tr>
214            <tr><td>McCabe modular design</td><td>           1</td></tr>
215          </table>
216         
217       
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