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| 26 | <h1>IDLdoc API documentation</h1> |
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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?format=raw" title="Overview of library">Overview</a></td> |
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| 39 | <td >Directory</td> |
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| 47 | <td><a href="./../../../idldoc-index.html?format=raw" title="Index of files, routines, and parameters">Index</a></td> |
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| 57 | <td >Source</td> |
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| 61 | <td><a href="./../../../idldoc-help.html?format=raw" title="Help on IDLdoc">Help</a></td> |
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| 64 | <td >Etc</td> |
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| 66 | <td id="flexible">Developer documentation</td> |
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| 67 | </tr> |
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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 | <a href="vecteur.html"><<prev file</a> | next file >> <a href="velovect.html" target="_TOP">view single page</a> | <a href="./../../../index.html?format=raw" target="_TOP">view frames</a> summary: fields | routine details: <a href="#routine_details">routine</a> |
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| 76 | </div> |
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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?format=raw">ToBeReviewed/PLOTS/VECTEUR/</a></h1> |
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| 82 | <h2 class="pro_file">velovect.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"></div> |
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| 90 | |
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| 93 | |
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| 95 | |
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| 96 | |
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| 97 | |
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| 98 | |
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| 99 | <div id="routine_details"> |
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| 100 | |
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| 101 | |
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| 102 | <div class="routine_details" id="_VELOVECT"> |
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| 103 | |
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| 104 | <h2><a class="top" href="#container">top</a>VELOVECT </h2> |
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| 105 | |
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| 106 | <p class="header"> |
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| 107 | VELOVECT<span class="result">, <a href="#_VELOVECT_param_U">U</a>, <a href="#_VELOVECT_param_V">V</a>, <a href="#_VELOVECT_param_X">X</a>, <a href="#_VELOVECT_param_Y">Y</a></span>, <a href="#_VELOVECT_keyword_Missing">Missing</a>=<span class="result">Missing</span>, <a href="#_VELOVECT_keyword_Length">Length</a>=<span class="result">Length</span>, <a href="#_VELOVECT_keyword_Dots">Dots</a>=<span class="result">Dots</span>, <a href="#_VELOVECT_keyword_Color">Color</a>=<span class="result">Color</span>, <a href="#_VELOVECT_keyword_CLIP">CLIP</a>=<span class="result">CLIP</span>, <a href="#_VELOVECT_keyword_NOCLIP">NOCLIP</a>=<span class="result">NOCLIP</span>, <a href="#_VELOVECT_keyword_OVERPLOT">OVERPLOT</a>=<span class="result">OVERPLOT</span>, <a href="#_VELOVECT_keyword__EXTRA">_EXTRA</a>=<span class="result">_EXTRA</span></p> |
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| 108 | |
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[101] | 109 | <div class="comments"> |
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| 110 | NAME: |
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| 111 | VELOVECT |
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[89] | 112 | |
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[101] | 113 | PURPOSE: |
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| 114 | Produce a two-dimensional velocity field plot. |
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| 115 | |
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| 116 | A directed arrow is drawn at each point showing the direction and |
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| 117 | magnitude of the field. |
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| 118 | |
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| 119 | CATEGORY: |
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| 120 | Plotting, two-dimensional. |
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| 121 | |
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| 122 | CALLING SEQUENCE: |
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| 123 | VELOVECT, U, V [, X, Y] |
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| 124 | |
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| 125 | INPUTS: |
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| 126 | U: The X component of the two-dimensional field. |
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| 127 | U must be a two-dimensional array. |
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| 128 | |
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| 129 | V: The Y component of the two dimensional field. Y must have |
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| 130 | the same dimensions as X. The vector at point [i,j] has a |
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| 131 | magnitude of: |
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| 132 | |
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| 133 | (U[i,j]^2 + V[i,j]^2)^0.5 |
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| 134 | |
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| 135 | and a direction of: |
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| 136 | |
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| 137 | ATAN2(V[i,j],U[i,j]). |
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| 138 | |
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| 139 | OPTIONAL INPUT PARAMETERS: |
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| 140 | X: Optional abcissae values. X must be a vector with a length |
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| 141 | equal to the first dimension of U and V. |
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| 142 | |
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| 143 | Y: Optional ordinate values. Y must be a vector with a length |
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| 144 | equal to the first dimension of U and V. |
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| 145 | |
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| 146 | KEYWORD INPUT PARAMETERS: |
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| 147 | COLOR: The color index used for the plot. |
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| 148 | |
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| 149 | DOTS: Set this keyword to 1 to place a dot at each missing point. |
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| 150 | Set this keyword to 0 or omit it to draw nothing for missing |
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| 151 | points. Has effect only if MISSING is specified. |
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| 152 | |
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| 153 | LENGTH: Length factor. The default of 1.0 makes the longest (U,V) |
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| 154 | vector the length of a cell. |
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| 155 | |
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| 156 | MISSING: Missing data value. Vectors with a LENGTH greater |
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| 157 | than MISSING are ignored. |
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| 158 | |
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| 159 | OVERPLOT: Set this keyword to make VELOVECT "overplot". That is, the |
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| 160 | current graphics screen is not erased, no axes are drawn, and |
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| 161 | the previously established scaling remains in effect. |
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| 162 | |
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| 163 | |
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| 164 | Note: All other keywords are passed directly to the PLOT procedure |
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| 165 | and may be used to set option such as TITLE, POSITION, |
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| 166 | NOERASE, etc. |
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| 167 | OUTPUTS: |
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| 168 | None. |
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| 169 | |
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| 170 | COMMON BLOCKS: |
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| 171 | None. |
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| 172 | |
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| 173 | SIDE EFFECTS: |
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| 174 | Plotting on the selected device is performed. System |
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| 175 | variables concerning plotting are changed. |
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| 176 | |
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| 177 | RESTRICTIONS: |
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| 178 | None. |
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| 179 | |
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| 180 | PROCEDURE: |
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| 181 | Straightforward. Unrecognized keywords are passed to the PLOT |
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| 182 | procedure. |
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| 183 | |
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| 184 | MODIFICATION HISTORY: |
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| 185 | DMS, RSI, Oct., 1983. |
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| 186 | For Sun, DMS, RSI, April, 1989. |
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| 187 | Added TITLE, Oct, 1990. |
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| 188 | Added POSITION, NOERASE, COLOR, Feb 91, RES. |
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| 189 | August, 1993. Vince Patrick, Adv. Visualization Lab, U. of Maryland, |
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| 190 | fixed errors in math. |
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| 191 | August, 1993. DMS, Added _EXTRA keyword inheritance. |
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| 192 | January, 1994, KDB. Fixed integer math which produced 0 and caused |
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| 193 | divide by zero errors. |
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| 194 | December, 1994, MWR. Added _EXTRA inheritance for PLOTS and OPLOT. |
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| 195 | June, 1995, MWR. Removed _EXTRA inheritance for PLOTS and changed |
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| 196 | OPLOT to PLOTS. |
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| 197 | September, 1996, GGS. Changed denominator of x_step and y_step vars. |
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| 198 | February, 1998, DLD. Add support for CLIP and NO_CLIP keywords. |
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| 199 | June, 1998, DLD. Add support for OVERPLOT keyword.</div> |
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| 200 | |
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[89] | 201 | |
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| 203 | |
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| 204 | <h3>Parameters</h3> |
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| 205 | |
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| 206 | |
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| 207 | <h4 id="_VELOVECT_param_U">U |
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| 208 | |
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| 215 | |
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| 216 | </h4> |
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| 217 | |
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| 218 | <div class="comments"></div> |
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| 219 | |
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| 220 | <h4 id="_VELOVECT_param_V">V |
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| 228 | |
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| 229 | </h4> |
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| 230 | |
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| 231 | <div class="comments"></div> |
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| 232 | |
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| 233 | <h4 id="_VELOVECT_param_X">X |
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| 234 | |
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| 242 | </h4> |
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| 243 | |
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| 244 | <div class="comments"></div> |
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| 245 | |
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| 246 | <h4 id="_VELOVECT_param_Y">Y |
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| 255 | </h4> |
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| 257 | <div class="comments"></div> |
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| 258 | |
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| 263 | |
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| 264 | <h3>Keywords</h3> |
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| 265 | |
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| 266 | <h4 id="_VELOVECT_keyword_Missing">Missing |
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| 267 | |
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| 274 | |
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| 275 | </h4> |
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| 276 | |
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| 277 | <div class="comments"></div> |
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| 278 | |
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| 279 | <h4 id="_VELOVECT_keyword_Length">Length |
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| 280 | |
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| 288 | </h4> |
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| 289 | |
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| 290 | <div class="comments"></div> |
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| 291 | |
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| 292 | <h4 id="_VELOVECT_keyword_Dots">Dots |
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| 293 | |
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| 294 | |
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| 301 | </h4> |
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| 302 | |
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| 303 | <div class="comments"></div> |
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| 304 | |
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| 305 | <h4 id="_VELOVECT_keyword_Color">Color |
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| 306 | |
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| 313 | |
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| 314 | </h4> |
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| 315 | |
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| 316 | <div class="comments"></div> |
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| 317 | |
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| 318 | <h4 id="_VELOVECT_keyword_CLIP">CLIP |
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| 319 | |
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| 320 | |
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| 321 | |
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| 325 | |
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| 326 | |
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| 327 | </h4> |
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| 328 | |
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| 329 | <div class="comments"></div> |
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| 330 | |
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| 331 | <h4 id="_VELOVECT_keyword_NOCLIP">NOCLIP |
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| 332 | |
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| 340 | </h4> |
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| 341 | |
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| 342 | <div class="comments"></div> |
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| 343 | |
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| 344 | <h4 id="_VELOVECT_keyword_OVERPLOT">OVERPLOT |
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| 353 | </h4> |
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| 354 | |
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| 355 | <div class="comments"></div> |
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| 356 | |
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| 357 | <h4 id="_VELOVECT_keyword__EXTRA">_EXTRA |
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| 366 | </h4> |
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| 397 | </div> |
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| 401 | <div id="tagline">Produced by IDLdoc 2.0.</div> |
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