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| 9 | <title>cmapply.pro (SAXO Documentation)</title> |
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| 23 | <body onload="setTitle();"> |
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| 24 | |
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| 25 | <div id="navbar_title"> |
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| 26 | <h1>SAXO Documentation</h1> |
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| 27 | </div> |
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| 28 | |
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| 30 | <div id="main_navbar"> |
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| 31 | |
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| 32 | <table cellspacing="0"> |
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| 33 | <tr> |
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| 34 | |
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| 35 | <td><a href="./../overview.html" title="Overview of library">Overview</a></td> |
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| 36 | |
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| 37 | |
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| 38 | |
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| 39 | <td >Directory</td> |
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| 42 | |
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| 43 | <td><a href="./../idldoc-categories.html" title="Browse library by category">Categories</a></td> |
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| 44 | |
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| 45 | |
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| 46 | |
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| 47 | <td><a href="./../idldoc-index.html" title="Index of files, routines, and parameters">Index</a></td> |
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| 48 | |
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| 49 | |
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| 50 | |
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| 51 | <td><a href="./../search-page.html" title="Search library">Search</a></td> |
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| 52 | |
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| 53 | |
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| 54 | <td id="selected">File</td> |
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| 55 | |
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| 56 | |
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| 57 | <td><a href="../../../Matrix//cmapply.pro" title="Source code of a file">Source</a></td> |
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| 58 | |
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| 59 | |
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| 60 | |
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| 61 | <td><a href="./../idldoc-help.html" title="Help on IDLdoc">Help</a></td> |
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| 62 | |
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| 63 | |
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| 64 | <td >Etc</td> |
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| 65 | |
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| 66 | <td id="flexible">Developer documentation</td> |
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| 67 | </tr> |
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| 68 | </table> |
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| 69 | |
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| 70 | </div> |
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| 71 | |
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| 72 | <div id="secondary_navbar"> |
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| 73 | |
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| 74 | << prev file | <a href="cmset_op.html">next file >></a> <a href="cmapply.html" target="_TOP">view single page</a> | <a href="./../index.html" target="_TOP">view frames</a> summary: fields | <a href="#routine_summary">routine</a> details: <a href="#routine_details">routine</a> |
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| 75 | |
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| 76 | </div> |
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| 77 | |
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| 78 | |
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| 79 | <div id="container"> |
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| 80 | |
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| 81 | <h1 class="directory"><a href="directory-overview.html">Matrix/</a></h1> |
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| 82 | <h2 class="pro_file">cmapply.pro</h2> |
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| 83 | |
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| 84 | <div id="file_attr"> |
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| 85 | <dl> |
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| 86 | </dl> |
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| 87 | </div> |
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| 88 | |
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| 89 | <div id="file_comments"> |
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| 90 | Utility function, adapted from CMPRODUCT |
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| 91 | |
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| 92 | |
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| 93 | cmapply_redim : Utility function, used to collect collaped dimensions |
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| 94 | |
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| 95 | |
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| 96 | Applies a function to specified dimensions of an array |
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| 97 | |
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| 98 | Description: |
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| 99 | |
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| 100 | CMAPPLY will apply one of a few select functions to specified |
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| 101 | dimensions of an array. Unlike some IDL functions, you *do* have |
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| 102 | a choice of which dimensions that are to be "collapsed" by this |
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| 103 | function. Iterative loops are avoided where possible, for |
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| 104 | performance reasons. |
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| 105 | |
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| 106 | The possible functions are: (and number of loop iterations:) |
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| 107 | + - Performs a sum (as in TOTAL) number of collapsed dimensions |
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| 108 | AND - Finds LOGICAL "AND" (not bitwise) same |
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| 109 | OR - Finds LOGICAL "OR" (not bitwise) same |
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| 110 | * - Performs a product LOG_2[no. of collapsed elts.] |
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| 111 | |
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| 112 | MIN - Finds the minimum value smaller of no. of collapsed |
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| 113 | MAX - Finds the maximum value or output elements |
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| 114 | |
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| 115 | USER - Applies user-defined function no. of output elements |
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| 116 | |
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| 117 | |
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| 118 | It is possible to perform user-defined operations arrays using |
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| 119 | CMAPPLY. The OP parameter is set to 'USER:FUNCTNAME', where |
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| 120 | FUNCTNAME is the name of a user-defined function. The user |
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| 121 | defined function should be defined such that it accepts a single |
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| 122 | parameter, a vector, and returns a single scalar value. Here is a |
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| 123 | prototype for the function definition: |
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| 124 | |
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| 125 | FUNCTION FUNCTNAME, x, KEYWORD1=key1, ... |
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| 126 | scalar = ... function of x or keywords ... |
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| 127 | RETURN, scalar |
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| 128 | END |
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| 129 | |
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| 130 | The function may accept keywords. Keyword values are passed in to |
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| 131 | CMAPPLY through the FUNCTARGS keywords parameter, and passed to |
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| 132 | the user function via the _EXTRA mechanism. Thus, while the |
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| 133 | definition of the user function is highly constrained in the |
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| 134 | number of positional parameters, there is absolute freedom in |
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| 135 | passing keyword parameters. |
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| 136 | |
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| 137 | It's worth noting however, that the implementation of user-defined |
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| 138 | functions is not particularly optimized for speed. Users are |
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| 139 | encouraged to implement their own array if the number of output |
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| 140 | elements is large. |
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| 141 | </div> |
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| 142 | |
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| 143 | |
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| 144 | |
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| 145 | |
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| 146 | |
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| 147 | |
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| 148 | |
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| 149 | |
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| 150 | <div id="routine_summary"> |
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| 151 | <h2>Routine summary</h2> |
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| 152 | |
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| 153 | <dl> |
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| 154 | |
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| 155 | <dt><p><a href="#_cmapply_product"><span class="result">result = </span>cmapply_product(<span class="result">x</span>)</a></p><dt> |
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| 156 | <dd></dd> |
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| 157 | |
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| 158 | <dt><p><a href="#_cmapply_redim">cmapply_redim<span class="result">, newarr, dimapply, dimkeep, nkeep, totcol, totkeep</span></a></p><dt> |
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| 159 | <dd></dd> |
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| 160 | |
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| 161 | <dt><p><a href="#_cmapply"><span class="result">result = </span>cmapply(<span class="result">op, array[, dimapply]</span>, double=<span class="result">double</span>, type=<span class="result">type</span>, functargs=<span class="result">functargs</span>, nocatch=<span class="result">nocatch</span>)</a></p><dt> |
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| 162 | <dd> </dd> |
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| 163 | |
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| 164 | </dl> |
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| 165 | </div> |
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| 166 | |
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| 167 | |
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| 168 | <div id="routine_details"> |
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| 169 | |
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| 170 | |
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| 171 | <div class="routine_details" id="_cmapply_product"> |
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| 172 | |
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| 173 | <h2><a class="top" href="#container">top</a>cmapply_product </h2> |
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| 174 | |
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| 175 | <p class="header"> |
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| 176 | <span class="result">result = </span>cmapply_product(<span class="result"><a href="#_cmapply_product_param_x">x</a></span>)</p> |
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| 177 | |
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| 178 | <div class="comments"></div> |
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| 179 | |
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| 180 | |
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| 181 | |
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| 182 | |
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| 183 | <h3>Parameters</h3> |
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| 184 | |
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| 185 | |
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| 186 | <h4 id="_cmapply_product_param_x">x |
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| 187 | |
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| 188 | |
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| 189 | |
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| 190 | |
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| 191 | |
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| 192 | |
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| 193 | |
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| 194 | |
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| 195 | </h4> |
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| 196 | |
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| 197 | <div class="comments"> |
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| 198 | |
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| 199 | </div> |
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| 200 | |
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| 201 | |
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| 202 | |
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| 203 | |
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| 204 | |
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| 205 | |
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| 206 | |
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| 207 | <h3>Version history</h3> |
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| 208 | |
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| 209 | <h4>Version</h4><div class="preformat"> $Id: cmapply.pro 163 2006-08-29 12:59:46Z navarro $ |
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| 210 | </div> |
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| 211 | |
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| 212 | |
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| 213 | |
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| 214 | <h3>Known issues</h3> |
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| 215 | |
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| 216 | |
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| 217 | <h4>Todo items</h4><div class="preformat"> seb</div> |
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| 218 | |
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| 219 | |
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| 220 | |
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| 221 | |
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| 222 | |
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| 223 | |
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| 224 | |
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| 225 | |
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| 226 | |
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| 227 | |
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| 228 | <h3>Statistics</h3> |
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| 229 | <table class="statistics"> |
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| 230 | <tr><td>McCabe cyclic</td><td> 3</td></tr> |
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| 231 | <tr><td>McCabe essential</td><td> 1</td></tr> |
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| 232 | <tr><td>McCabe modular design</td><td> 1</td></tr> |
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| 233 | </table> |
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| 234 | |
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| 235 | |
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| 236 | </div> |
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| 237 | |
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| 238 | |
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| 239 | <div class="routine_details" id="_cmapply_redim"> |
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| 240 | |
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| 241 | <h2><a class="top" href="#container">top</a>cmapply_redim </h2> |
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| 242 | |
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| 243 | <p class="header"> |
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| 244 | cmapply_redim<span class="result">, <a href="#_cmapply_redim_param_newarr">newarr</a>, <a href="#_cmapply_redim_param_dimapply">dimapply</a>, <a href="#_cmapply_redim_param_dimkeep">dimkeep</a>, <a href="#_cmapply_redim_param_nkeep">nkeep</a>, <a href="#_cmapply_redim_param_totcol">totcol</a>, <a href="#_cmapply_redim_param_totkeep">totkeep</a></span></p> |
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| 245 | |
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| 246 | <div class="comments"></div> |
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| 247 | |
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| 248 | |
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| 249 | |
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| 250 | |
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| 251 | <h3>Parameters</h3> |
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| 252 | |
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| 253 | |
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| 254 | <h4 id="_cmapply_redim_param_newarr">newarr |
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| 255 | |
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| 256 | |
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| 257 | |
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| 258 | |
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| 259 | |
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| 260 | |
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| 261 | |
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| 262 | |
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| 263 | </h4> |
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| 264 | |
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| 265 | <div class="comments"> |
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| 266 | |
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| 267 | </div> |
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| 268 | |
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| 269 | <h4 id="_cmapply_redim_param_dimapply">dimapply |
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| 270 | |
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| 271 | |
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| 272 | |
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| 273 | |
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| 274 | |
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| 275 | |
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| 276 | |
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| 277 | |
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| 278 | </h4> |
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| 279 | |
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| 280 | <div class="comments"> |
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| 281 | |
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| 282 | </div> |
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| 283 | |
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| 284 | <h4 id="_cmapply_redim_param_dimkeep">dimkeep |
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| 285 | |
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| 286 | |
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| 287 | |
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| 288 | |
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| 289 | |
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| 290 | |
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| 291 | |
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| 292 | |
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| 293 | </h4> |
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| 294 | |
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| 295 | <div class="comments"> |
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| 296 | |
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| 297 | </div> |
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| 298 | |
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| 299 | <h4 id="_cmapply_redim_param_nkeep">nkeep |
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| 300 | |
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| 301 | |
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| 302 | |
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| 303 | |
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| 304 | |
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| 305 | |
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| 306 | |
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| 307 | |
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| 308 | </h4> |
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| 309 | |
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| 310 | <div class="comments"> |
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| 311 | |
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| 312 | </div> |
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| 313 | |
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| 314 | <h4 id="_cmapply_redim_param_totcol">totcol |
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| 315 | |
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| 316 | |
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| 317 | |
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| 318 | |
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| 319 | |
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| 320 | |
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| 321 | |
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| 322 | |
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| 323 | </h4> |
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| 324 | |
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| 325 | <div class="comments"> |
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| 326 | |
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| 327 | </div> |
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| 328 | |
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| 329 | <h4 id="_cmapply_redim_param_totkeep">totkeep |
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| 330 | |
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| 331 | |
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| 332 | |
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| 333 | |
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| 334 | |
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| 335 | |
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| 336 | |
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| 337 | |
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| 338 | </h4> |
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| 339 | |
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| 340 | <div class="comments"> |
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| 341 | |
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| 342 | </div> |
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| 343 | |
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| 344 | |
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| 345 | |
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| 346 | |
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| 347 | |
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| 348 | |
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| 349 | |
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| 350 | |
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| 351 | |
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| 352 | |
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| 353 | |
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| 354 | |
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| 355 | |
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| 356 | <h3>Known issues</h3> |
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| 357 | |
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| 358 | |
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| 359 | <h4>Todo items</h4><div class="preformat"> seb</div> |
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| 360 | |
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| 361 | |
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| 362 | |
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| 363 | |
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| 364 | |
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| 365 | |
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| 366 | |
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| 367 | |
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| 368 | |
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| 369 | |
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| 370 | <h3>Statistics</h3> |
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| 371 | <table class="statistics"> |
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| 372 | <tr><td>McCabe cyclic</td><td> 4</td></tr> |
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| 373 | <tr><td>McCabe essential</td><td> 1</td></tr> |
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| 374 | <tr><td>McCabe modular design</td><td> 1</td></tr> |
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| 375 | </table> |
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| 376 | |
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| 377 | |
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| 378 | </div> |
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| 379 | |
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| 380 | |
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| 381 | <div class="routine_details" id="_cmapply"> |
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| 382 | |
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| 383 | <h2><a class="top" href="#container">top</a>cmapply <span class="categories"> |
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| 384 | Array |
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| 385 | </span></h2> |
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| 386 | |
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| 387 | <p class="header"> |
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| 388 | <span class="result">result = </span>cmapply(<span class="result"><a href="#_cmapply_param_op">op</a>, <a href="#_cmapply_param_array">array</a>[, <a href="#_cmapply_param_dimapply">dimapply</a>]</span>, <a href="#_cmapply_keyword_double">double</a>=<span class="result">double</span>, <a href="#_cmapply_keyword_type">type</a>=<span class="result">type</span>, <a href="#_cmapply_keyword_functargs">functargs</a>=<span class="result">functargs</span>, <a href="#_cmapply_keyword_nocatch">nocatch</a>=<span class="result">nocatch</span>)</p> |
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| 389 | |
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| 390 | <div class="comments"> |
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| 391 | </div> |
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| 392 | |
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| 393 | <h3>Return value</h3><div class="preformat"> |
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| 394 | An array of the required TYPE, whose elements are the result of |
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| 395 | the requested operation. Depending on the operation and number of |
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| 396 | elements in the input array, the result may be vulnerable to |
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| 397 | overflow or underflow. |
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| 398 | </div> |
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| 399 | |
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| 400 | |
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| 401 | <h3>Parameters</h3> |
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| 402 | |
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| 403 | |
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| 404 | <h4 id="_cmapply_param_op">op |
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| 405 | <span class="attr">in</span> |
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| 406 | |
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| 407 | |
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| 408 | <span class="attr">required</span> |
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| 409 | |
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| 410 | <span class="attr">type:</span> <span class="value">string</span> |
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| 411 | |
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| 412 | |
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| 413 | </h4> |
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| 414 | |
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| 415 | <div class="comments"> |
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| 416 | The operation to perform, as a string. May be upper or lower case. |
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| 417 | |
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| 418 | If a user-defined operation is to be passed, then OP is of |
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| 419 | the form, 'USER:FUNCTNAME', where FUNCTNAME is the name of |
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| 420 | the user-defined function. |
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| 421 | </div> |
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| 422 | |
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| 423 | <h4 id="_cmapply_param_array">array |
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| 424 | <span class="attr">in</span> |
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| 425 | |
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| 426 | |
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| 427 | <span class="attr">required</span> |
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| 428 | |
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| 429 | <span class="attr">type:</span> <span class="value">array</span> |
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| 430 | |
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| 431 | |
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| 432 | </h4> |
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| 433 | |
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| 434 | <div class="comments"> |
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| 435 | An array of values to be operated on. |
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| 436 | Must not be of type STRING (7) or STRUCTURE (8). |
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| 437 | </div> |
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| 438 | |
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| 439 | <h4 id="_cmapply_param_dimapply">dimapply |
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| 440 | <span class="attr">in</span> |
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| 441 | |
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| 442 | <span class="attr">optional</span> |
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| 443 | |
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| 444 | |
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| 445 | <span class="attr">type:</span> <span class="value">array</span> |
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| 446 | <span class="attr">default:</span> <span class="value">1 (ie, first dimension)</span> |
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| 447 | |
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| 448 | </h4> |
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| 449 | |
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| 450 | <div class="comments"> |
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| 451 | An array of dimensions that are to be "collapsed", where |
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| 452 | the the first dimension starts with 1 (ie, same convention |
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| 453 | as IDL function TOTAL). Whereas TOTAL only allows one |
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| 454 | dimension to be added, you can specify multiple dimensions |
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| 455 | to CMAPPLY. Order does not matter, since all operations |
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| 456 | are associative and transitive. NOTE: the dimensions refer |
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| 457 | to the *input* array, not the output array. IDL allows a |
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| 458 | maximum of 8 dimensions. |
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| 459 | </div> |
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| 460 | |
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| 461 | |
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| 462 | |
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| 463 | |
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| 464 | |
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| 465 | |
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| 466 | <h3>Keywords</h3> |
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| 467 | |
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| 468 | <h4 id="_cmapply_keyword_double">double |
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| 469 | |
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| 470 | |
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| 471 | |
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| 472 | |
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| 473 | |
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| 474 | |
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| 475 | <span class="attr">default:</span> <span class="value">not set</span> |
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| 476 | |
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| 477 | </h4> |
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| 478 | |
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| 479 | <div class="comments"> |
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| 480 | Set this if you wish the internal computations to be done |
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| 481 | in double precision if necessary. If ARRAY is double |
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| 482 | precision (real or complex) then DOUBLE=1 is implied. |
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| 483 | </div> |
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| 484 | |
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| 485 | <h4 id="_cmapply_keyword_type">type |
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| 486 | |
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| 487 | |
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| 488 | |
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| 489 | |
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| 490 | |
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| 491 | |
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| 492 | <span class="attr">default:</span> <span class="value">same as input type</span> |
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| 493 | |
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| 494 | </h4> |
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| 495 | |
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| 496 | <div class="comments"> |
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| 497 | Set this to the IDL code of the desired output type (refer |
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| 498 | to documentation of SIZE()). Internal results will be |
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| 499 | rounded to the nearest integer if the output type is an |
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| 500 | integer type. |
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| 501 | </div> |
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| 502 | |
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| 503 | <h4 id="_cmapply_keyword_functargs">functargs |
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| 504 | |
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| 505 | |
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| 506 | |
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| 508 | |
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| 509 | |
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| 510 | |
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| 511 | |
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| 512 | </h4> |
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| 513 | |
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| 514 | <div class="comments"> |
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| 515 | If OP is 'USER:...', then the contents of this keyword |
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| 516 | are passed to the user function using the _EXTRA |
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| 517 | mechanism. This way you can pass additional data to |
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| 518 | your user-supplied function, via keywords, without |
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| 519 | using common blocks. |
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| 520 | DEFAULT: undefined (i.e., no keywords passed by _EXTRA) |
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| 521 | </div> |
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| 522 | |
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| 523 | <h4 id="_cmapply_keyword_nocatch">nocatch |
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| 524 | |
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| 525 | |
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| 526 | |
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| 527 | |
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| 528 | |
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| 529 | |
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| 530 | |
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| 531 | |
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| 532 | </h4> |
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| 533 | |
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| 534 | <div class="comments"></div> |
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| 535 | |
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| 536 | |
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| 537 | |
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| 538 | <h3>Examples</h3><div class="preformat"> |
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| 539 | |
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| 540 | First example: Shows how CMAPPLY can be used to total the second dimension of the |
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| 541 | array called IN. This is equivalent to OUT = TOTAL(IN, 2) |
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| 542 | |
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| 543 | IDL> IN = INDGEN(5,5) |
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| 544 | IDL> OUT = CMAPPLY('+', IN, [2]) |
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| 545 | IDL> HELP, OUT |
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| 546 | OUT INT = Array[5] |
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| 547 | |
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| 548 | Second example: Input is assumed to be an 5x100 array of 1's and |
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| 549 | 0's indicating the status of 5 detectors at 100 points in time. |
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| 550 | The desired output is an array of 100 values, indicating whether |
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| 551 | all 5 detectors are on (=1) at one time. Use the logical AND |
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| 552 | operation. |
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| 553 | |
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| 554 | IDL> IN = detector_status ; 5x100 array |
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| 555 | IDL> OUT = CMAPPLY('AND', IN, [1]) ; collapses 1st dimension |
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| 556 | IDL> HELP, OUT |
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| 557 | OUT BYTE = Array[100] |
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| 558 | |
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| 559 | (note that MIN could also have been used in this particular case, |
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| 560 | although there would have been more loop iterations). |
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| 561 | |
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| 562 | Third example: Shows sum over first and third dimensions in an |
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| 563 | array with dimensions 4x4x4: |
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| 564 | |
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| 565 | IDL> IN = INDGEN(4,4,4) |
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| 566 | IDL> OUT = CMAPPLY('+', IN, [1,3]) |
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| 567 | IDL> PRINT, OUT |
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| 568 | 408 472 536 600 |
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| 569 | |
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| 570 | Fourth example: A user-function (MEDIAN) is used: |
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| 571 | |
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| 572 | IDL> IN = RANDOMN(SEED,10,10,5) |
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| 573 | IDL> OUT = CMAPPLY('USER:MEDIAN', IN, 3) |
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| 574 | IDL> HELP, OUT |
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| 575 | OUT FLOAT = Array[10, 10] |
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| 576 | |
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| 577 | (OUT[i,j] is the median value of IN[i,j,*]) |
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| 578 | </div> |
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| 579 | <h3>Version history</h3> |
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| 580 | |
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| 581 | <h4>Version</h4><div class="preformat"> $Id: cmapply.pro 163 2006-08-29 12:59:46Z navarro $ |
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| 582 | </div> |
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| 583 | <h4>History</h4><div class="preformat"> Mar 1998, Written, CM |
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| 584 | Changed usage message to not bomb, 24 Mar 2000, CM |
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| 585 | Significant rewrite for *, MIN and MAX (inspired by Todd Clements |
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| 586 | <Todd_Clements@alumni.hmc.edu>); FOR loop indices are now type |
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| 587 | LONG; copying terms are liberalized, CM, 22, Aug 2000 |
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| 588 | More efficient MAX/MIN (inspired by Alex Schuster), CM, 25 Jan |
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| 589 | 2002 |
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| 590 | Make new MAX/MIN actually work with 3d arrays, CM, 08 Feb 2002 |
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| 591 | Add user-defined functions, ON_ERROR, CM, 09 Feb 2002 |
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| 592 | Correct bug in MAX/MIN initialization of RESULT, CM, 05 Dec 2002 |
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| 593 | |
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| 594 | Author: Craig B. Markwardt, NASA/GSFC Code 662, Greenbelt, MD 20770 |
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| 595 | craigm@lheamail.gsfc.nasa.gov |
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| 596 | </div> |
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| 597 | |
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| 598 | |
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| 611 | |
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| 612 | |
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| 613 | <h3>Statistics</h3> |
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| 614 | <table class="statistics"> |
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| 615 | <tr><td>McCabe cyclic</td><td> 36</td></tr> |
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| 616 | <tr><td>McCabe essential</td><td> 1</td></tr> |
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| 617 | <tr><td>McCabe modular design</td><td> 1</td></tr> |
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| 618 | </table> |
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| 619 | |
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| 620 | |
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| 621 | </div> |
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| 622 | |
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| 623 | </div> |
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| 624 | |
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| 625 | |
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| 626 | |
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| 627 | <div id="tagline">Produced by IDLdoc 2.0.</div> |
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| 628 | |
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| 629 | </div> |
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| 630 | |
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| 631 | </body> |
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| 632 | </html> |
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