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| 3 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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| 4 | <head> |
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| 5 | <title>velovect.pro (SAXO Documentation Assistant)</title> |
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| 6 | </head> |
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| 7 | |
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| 8 | <body text="#000000" bgcolor="#FFFFFF"> |
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| 11 | <!-- Navbar template takes a structure with the following fields: |
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| 36 | summary_routine_href : |
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| 38 | |
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| 39 | title : |
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| 40 | subtitle : |
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| 41 | user : |
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| 42 | --> |
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| 43 | |
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| 44 | |
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| 45 | <table border="0" cellpadding="0" cellspacing="0" width="98%" bgcolor="#F0F0FF" valign="bottom"> |
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| 46 | <tr> |
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| 47 | <td width="10%"> |
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| 48 | <a href="vecteur.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=""><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">ToBeReviewed/PLOTS/VECTEUR/</font></h1> |
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| 58 | <h2>velovect.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 | Produce a two-dimensional velocity field plot. |
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| 65 | |
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| 66 | A directed arrow is drawn at each point showing the direction and |
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| 67 | magnitude of the field. |
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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 | |
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| 73 | <a name="#_velovect"></a> |
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| 74 | |
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| 75 | <h2>velovect <font size="-1" color="#006633"> |
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| 76 | Plotting, two-dimensional. |
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| 77 | |
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| 78 | </font></h2> |
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| 79 | |
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| 80 | <p><font face="Courier">velovect<i>, <a href="#_velovect_keyword_U">U</a>, <a href="#_velovect_keyword_V">V</a>[, <a href="#_velovect_keyword_X">X</a>][, <a href="#_velovect_keyword_Y">Y</a>]</i>, <a href="#_velovect_keyword_Missing">Missing</a>=<i>Missing</i>, <a href="#_velovect_keyword_Length">Length</a>=<i>Length</i>, <a href="#_velovect_keyword_Dots">Dots</a>=<i>Dots</i>, <a href="#_velovect_keyword_Color">Color</a>=<i>Color</i>, <a href="#_velovect_keyword_CLIP">CLIP</a>=<i>CLIP</i>, <a href="#_velovect_keyword_NOCLIP">NOCLIP</a>=<i>NOCLIP</i>, <a href="#_velovect_keyword_OVERPLOT">OVERPLOT</a>=<i>OVERPLOT</i>, <a href="#_velovect_keyword__EXTRA">_EXTRA</a>=<i>_EXTRA</i></font></p> |
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| 81 | |
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| 82 | |
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| 83 | |
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| 84 | |
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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="#_velovect_keyword_U"></a> |
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| 92 | <h4>U |
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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 | The X component of the two-dimensional field. |
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| 105 | U must be a two-dimensional array. |
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| 106 | |
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| 107 | |
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| 108 | |
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| 109 | <a name="#_velovect_keyword_V"></a> |
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| 110 | <h4>V |
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| 111 | <font size="-1" color="#006633">in</font> |
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| 112 | |
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| 113 | |
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| 114 | <font size="-1" color="#006633">required</font> |
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| 115 | |
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| 116 | |
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| 117 | |
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| 118 | |
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| 119 | </h4> |
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| 120 | |
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| 121 | |
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| 122 | The Y component of the two dimensional field. Y must have |
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| 123 | the same dimensions as X. The vector at point [i,j] has a |
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| 124 | magnitude of: |
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| 125 | |
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| 126 | (U[i,j]^2 + V[i,j]^2)^0.5 |
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| 127 | |
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| 128 | and a direction of: |
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| 129 | |
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| 130 | ATAN2(V[i,j],U[i,j]). |
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| 131 | |
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| 132 | |
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| 133 | |
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| 134 | <a name="#_velovect_keyword_X"></a> |
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| 135 | <h4>X |
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| 136 | <font size="-1" color="#006633">in</font> |
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| 137 | |
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| 138 | <font size="-1" color="#006633">optional</font> |
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| 139 | |
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| 140 | |
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| 141 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>vector</i></font> |
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| 142 | |
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| 143 | |
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| 144 | </h4> |
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| 145 | |
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| 146 | |
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| 147 | Optional abscissa values. X must be a vector with a length |
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| 148 | equal to the first dimension of U and V. |
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| 149 | |
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| 150 | |
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| 151 | |
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| 152 | <a name="#_velovect_keyword_Y"></a> |
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| 153 | <h4>Y |
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| 154 | <font size="-1" color="#006633">in</font> |
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| 155 | |
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| 156 | <font size="-1" color="#006633">optional</font> |
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| 157 | |
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| 158 | |
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| 159 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>vector</i></font> |
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| 160 | |
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| 161 | |
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| 162 | </h4> |
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| 163 | |
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| 164 | |
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| 165 | Optional ordinate values. Y must be a vector with a length |
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| 166 | equal to the first dimension of U and V. |
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| 167 | |
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| 168 | |
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| 169 | |
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| 170 | |
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| 171 | |
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| 172 | <h3>Keywords</h3> |
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| 173 | |
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| 174 | |
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| 175 | <a name="#_velovect_keyword_Missing"></a> |
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| 176 | <h4>Missing |
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| 177 | |
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| 178 | |
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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 | |
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| 184 | |
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| 185 | </h4> |
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| 186 | |
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| 187 | |
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| 188 | Missing data value. Vectors with a LENGTH greater |
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| 189 | than MISSING are ignored. |
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| 190 | |
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| 191 | |
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| 192 | <a name="#_velovect_keyword_Length"></a> |
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| 193 | <h4>Length |
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| 194 | |
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| 195 | |
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| 196 | |
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| 197 | |
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| 198 | |
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| 199 | |
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| 200 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>1.0</i></font> |
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| 201 | |
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| 202 | </h4> |
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| 203 | |
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| 204 | |
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| 205 | Length factor. The default of 1.0 makes the longest (U,V) |
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| 206 | vector the length of a cell. |
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| 207 | |
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| 208 | |
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| 209 | <a name="#_velovect_keyword_Dots"></a> |
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| 210 | <h4>Dots |
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| 211 | |
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| 212 | |
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| 213 | |
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| 214 | |
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| 215 | |
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| 216 | |
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| 217 | |
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| 218 | |
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| 219 | </h4> |
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| 220 | |
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| 221 | |
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| 222 | Set this keyword to 1 to place a dot at each missing point. |
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| 223 | Set this keyword to 0 or omit it to draw nothing for missing |
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| 224 | points. Has effect only if MISSING is specified. |
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| 225 | |
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| 226 | |
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| 227 | <a name="#_velovect_keyword_Color"></a> |
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| 228 | <h4>Color |
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| 229 | |
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| 230 | |
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| 231 | |
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| 232 | |
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| 233 | |
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| 234 | |
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| 235 | |
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| 236 | |
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| 237 | </h4> |
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| 238 | |
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| 239 | |
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| 240 | The color index used for the plot. |
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| 241 | |
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| 242 | |
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| 243 | <a name="#_velovect_keyword_CLIP"></a> |
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| 244 | <h4>CLIP |
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| 245 | |
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| 246 | |
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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 | |
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| 252 | |
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| 253 | </h4> |
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| 254 | |
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| 255 | |
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| 256 | |
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| 257 | |
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| 258 | <a name="#_velovect_keyword_NOCLIP"></a> |
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| 259 | <h4>NOCLIP |
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| 260 | |
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| 261 | |
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| 262 | |
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| 263 | |
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| 264 | |
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| 265 | |
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| 266 | |
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| 267 | |
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| 268 | </h4> |
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| 269 | |
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| 270 | |
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| 271 | |
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| 272 | |
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| 273 | <a name="#_velovect_keyword_OVERPLOT"></a> |
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| 274 | <h4>OVERPLOT |
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| 275 | |
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| 276 | |
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| 277 | |
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| 278 | |
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| 279 | |
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| 280 | |
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| 281 | |
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| 282 | |
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| 283 | </h4> |
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| 284 | |
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| 285 | |
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| 286 | Set this keyword to make VELOVECT "overplot". That is, the |
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| 287 | current graphics screen is not erased, no axes are drawn, and |
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| 288 | the previously established scaling remains in effect. |
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| 289 | |
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| 290 | |
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| 291 | <a name="#_velovect_keyword__EXTRA"></a> |
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| 292 | <h4>_EXTRA |
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| 293 | |
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| 294 | |
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| 295 | |
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| 296 | |
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| 297 | |
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| 298 | |
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| 299 | |
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| 300 | |
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| 301 | </h4> |
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| 302 | |
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| 303 | |
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| 304 | Used to pass your keywords. |
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| 305 | |
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| 306 | |
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| 307 | |
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| 308 | |
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| 309 | |
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| 310 | <h3>Version history</h3> |
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| 311 | |
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| 312 | <h4>Version</h4> |
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[168] | 313 | $Id: velovect.pro 163 2006-08-29 12:59:46Z navarro $ |
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[163] | 314 | |
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| 315 | <h4>History</h4> |
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| 316 | DMS, RSI, Oct., 1983. |
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| 317 | For Sun, DMS, RSI, April, 1989. |
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| 318 | Added TITLE, Oct, 1990. |
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| 319 | Added POSITION, NOERASE, COLOR, Feb 91, RES. |
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| 320 | August, 1993. Vince Patrick, Adv. Visualization Lab, U. of Maryland, |
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| 321 | fixed errors in math. |
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| 322 | August, 1993. DMS, Added _EXTRA keyword inheritance. |
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| 323 | January, 1994, KDB. Fixed integer math which produced 0 and caused |
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| 324 | divide by zero errors. |
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| 325 | December, 1994, MWR. Added _EXTRA inheritance for PLOTS and OPLOT. |
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| 326 | June, 1995, MWR. Removed _EXTRA inheritance for PLOTS and changed |
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| 327 | OPLOT to PLOTS. |
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| 328 | September, 1996, GGS. Changed denominator of x_step and y_step vars. |
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| 329 | February, 1998, DLD. Add support for CLIP and NO_CLIP keywords. |
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| 330 | June, 1998, DLD. Add support for OVERPLOT keyword. |
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| 331 | |
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| 332 | Copyright (c) 1983-1998, Research Systems, Inc. All rights reserved. |
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| 333 | Unauthorized reproduction prohibited. |
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| 334 | |
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| 335 | |
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| 336 | |
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| 337 | <h3>Known issues</h3> |
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| 338 | |
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| 339 | |
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| 340 | |
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| 341 | <h4>Restrictions</h4> |
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| 342 | Plotting on the selected device is performed. System |
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| 343 | variables concerning plotting are changed. |
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| 344 | Note: All other keywords are passed directly to the PLOT procedure |
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| 345 | and may be used to set option such as TITLE, POSITION, |
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| 346 | NOERASE, etc. |
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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 | |
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| 357 | <font size="-3"><p> </p></font> |
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| 358 | <hr size="1" color="#CCCCCC"/> |
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| 359 | |
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| 362 | |
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[177] | 363 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0 on Wed Sep 13 16:32:54 2006.</font></p> |
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[163] | 364 | |
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| 365 | </body> |
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| 366 | </html> |
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