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| 5 | <title>union.pro (SAXO Documentation Assistant)</title> |
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| 46 | <tr> |
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| 47 | <td width="10%"> |
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| 48 | <a href="make_selection.html"><img src="./../prev.gif" border="0" alt="Previous"></a></td> |
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| 49 | <td width="80%" align="center" valign="center"> |
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| 50 | <font size=-1><i>SAXO Documentation Assistant</i>: <a href="./../home.html">Overview</a></font></td> |
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| 51 | <td width="10%" align="right"> |
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| 52 | <a href="zero_one.html"><img src="./../next.gif" border="0" alt="Next"></a></td> |
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| 53 | </tr> |
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| 54 | </table> |
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| 55 | |
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| 56 | |
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| 57 | <h1><font size="-2">Matrix/</font></h1> |
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| 58 | <h2>union.pro</h2> |
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| 59 | |
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| 60 | <dl> |
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| 61 | </dl> |
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| 62 | |
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| 63 | |
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| 64 | find the union between 2 matrices of whole numbers |
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| 65 | |
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| 66 | see also <a href="..//Matrix/different.html">different</a> and <a href="..//Matrix/inter.html">inter</a>. |
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| 67 | |
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| 68 | |
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| 69 | |
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| 70 | |
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| 71 | |
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| 72 | <a name="#_union"></a> |
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| 73 | |
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| 74 | <h2>union <font size="-1" color="#006633"> |
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| 75 | Calculation |
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| 76 | </font></h2> |
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| 77 | |
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| 78 | <p><font face="Courier"><i>result = </i>union(<i><a href="#_union_keyword_a">a</a>, <a href="#_union_keyword_b">b</a></i>)</font></p> |
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| 79 | |
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| 80 | |
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| 81 | |
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| 82 | |
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| 83 | <h3>Return value</h3> |
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| 84 | an array containing the set of values in a and b. |
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| 85 | |
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| 86 | |
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| 87 | |
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| 88 | <h3>Parameters</h3> |
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| 89 | |
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| 90 | |
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| 91 | <a name="#_union_keyword_a"></a> |
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| 92 | <h4>a |
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| 93 | <font size="-1" color="#006633">in</font> |
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| 94 | |
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| 95 | |
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| 96 | <font size="-1" color="#006633">required</font> |
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| 97 | |
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| 98 | |
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| 99 | |
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| 100 | |
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| 101 | </h4> |
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| 102 | |
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| 103 | |
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| 104 | arrays of positive integers, which need |
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| 105 | not be sorted. Duplicate elements are ignored, as they have no |
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| 106 | effect on the result |
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| 107 | |
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| 108 | |
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| 109 | |
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| 110 | <a name="#_union_keyword_b"></a> |
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| 111 | <h4>b |
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| 112 | <font size="-1" color="#006633">in</font> |
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| 113 | |
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| 114 | |
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| 115 | <font size="-1" color="#006633">required</font> |
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| 116 | |
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| 117 | |
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| 118 | |
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| 119 | |
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| 120 | </h4> |
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| 121 | |
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| 122 | |
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| 123 | see a |
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| 124 | |
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| 125 | |
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| 126 | |
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| 127 | |
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| 128 | |
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| 129 | |
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| 130 | <h3>Examples</h3><pre> |
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| 131 | |
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| 132 | IDL> a = [2,4,6,8] |
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| 133 | IDL> b = [6,1,3,2] |
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| 134 | IDL> res=union(a,b) |
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| 135 | IDL> print, res |
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| 136 | 1 2 3 4 5 6 |
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| 137 | 8 |
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| 138 | this is the list ao all elements in either sets. |
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| 139 | |
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| 140 | </pre><h3>Version history</h3> |
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| 141 | |
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| 142 | <h4>Version</h4> |
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| 143 | $Id: union.pro 378 2008-08-12 12:35:46Z pinsard $ |
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| 144 | |
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| 145 | <h4>History</h4> |
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| 146 | <a href="http://www.dfanning.com/tips/set_operations.html"/> |
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| 147 | |
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| 148 | |
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| 149 | |
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| 150 | <h3>Known issues</h3> |
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| 151 | |
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| 152 | |
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| 153 | |
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| 154 | <h4>Restrictions</h4> |
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| 155 | These functions will not be efficient on sparse sets with wide |
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| 156 | ranges, as they trade memory for efficiency. |
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| 157 | The <a href="/Applications/itt/idl64/help/online_help/HISTOGRAM.html">HISTOGRAM</a> function |
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| 158 | is used, which creates arrays of size equal to the range of the |
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| 159 | resulting set. |
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| 170 | <font size="-3"><p> </p></font> |
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| 171 | <hr size="1" color="#CCCCCC"/> |
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| 176 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0.</font></p> |
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| 177 | |
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| 178 | </body> |
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| 179 | </html> |
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