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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>spl_fstdrv.pro (SAXO Documentation Assistant)</title> |
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| 6 | </head> |
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| 46 | <tr> |
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| 47 | <td width="10%"> |
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| 48 | <a href="quadrilateral2square.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="spl_incr.html"><img src="./../next.gif" border="0" alt="Next"></a></td> |
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| 53 | </tr> |
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| 54 | </table> |
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| 55 | |
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| 56 | |
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| 57 | <h1><font size="-2">Interpolation/</font></h1> |
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| 58 | <h2>spl_fstdrv.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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[242] | 64 | returns the values of the first derivative of |
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[187] | 65 | the interpolating function at the points X2i. It is a double |
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[163] | 66 | precision array. |
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| 67 | |
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| 68 | Given the arrays X and Y, which tabulate a function (with the X[i] |
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[242] | 69 | and Y[i] in ascending order), and given an input value X2, the |
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[290] | 70 | <a href="..//Interpolation/spl_incr.html">spl_incr</a> function returns an interpolated value for the given |
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[242] | 71 | values of X2. The interpolation method is based on cubic spline, corrected |
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| 72 | in a way that interpolated value are also in ascending order. |
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[163] | 73 | |
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| 74 | |
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| 75 | |
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| 76 | |
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| 77 | |
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| 78 | <a name="#_spl_fstdrv"></a> |
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| 79 | |
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| 80 | <h2>spl_fstdrv </h2> |
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| 81 | |
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| 82 | <p><font face="Courier"><i>result = </i>spl_fstdrv(<i><a href="#_spl_fstdrv_keyword_x">x</a>, <a href="#_spl_fstdrv_keyword_y">y</a>, <a href="#_spl_fstdrv_keyword_yscd">yscd</a>, <a href="#_spl_fstdrv_keyword_x2">x2</a></i>)</font></p> |
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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 | <h3>Return value</h3> |
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| 88 | y2: f'(x2) = y2. |
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| 89 | |
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| 90 | |
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| 91 | |
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| 92 | <h3>Parameters</h3> |
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| 93 | |
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| 94 | |
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| 95 | <a name="#_spl_fstdrv_keyword_x"></a> |
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| 96 | <h4>x |
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| 97 | <font size="-1" color="#006633">in</font> |
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| 98 | |
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| 99 | |
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| 100 | <font size="-1" color="#006633">required</font> |
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| 101 | |
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| 102 | |
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| 103 | |
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| 104 | |
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| 105 | </h4> |
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| 106 | |
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| 107 | |
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[242] | 108 | An n-elements (at least 2) input vector that specifies the |
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[163] | 109 | tabulate points in ascending order. |
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| 110 | |
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| 111 | |
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| 112 | |
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| 113 | <a name="#_spl_fstdrv_keyword_y"></a> |
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| 114 | <h4>y |
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| 115 | <font size="-1" color="#006633">in</font> |
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| 116 | |
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| 117 | |
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| 118 | <font size="-1" color="#006633">required</font> |
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| 119 | |
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| 120 | |
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| 121 | |
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| 122 | |
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| 123 | </h4> |
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| 124 | |
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| 125 | |
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[242] | 126 | f(x) = y. An n-elements input vector that specifies the values |
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[163] | 127 | of the tabulated function F(Xi) corresponding to Xi. |
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| 128 | |
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| 129 | |
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| 130 | |
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| 131 | <a name="#_spl_fstdrv_keyword_yscd"></a> |
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| 132 | <h4>yscd |
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| 133 | <font size="-1" color="#006633">in</font> |
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| 134 | |
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| 135 | |
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| 136 | <font size="-1" color="#006633">required</font> |
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| 137 | |
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| 138 | |
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| 139 | |
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| 140 | |
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| 141 | </h4> |
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| 142 | |
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| 143 | |
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[338] | 144 | The output from <a href="/Applications/itt/idl64/help/online_help/SPL_INIT.html">SPL_INIT</a> for the specified X and Y. |
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[163] | 145 | |
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| 146 | |
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| 147 | |
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| 148 | <a name="#_spl_fstdrv_keyword_x2"></a> |
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| 149 | <h4>x2 |
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| 150 | <font size="-1" color="#006633">in</font> |
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| 151 | |
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| 152 | |
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| 153 | <font size="-1" color="#006633">required</font> |
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| 154 | |
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[242] | 155 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i> scalar or array</i></font> |
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[163] | 156 | |
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| 157 | |
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| 158 | </h4> |
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| 159 | |
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| 160 | |
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| 161 | The input values for which the first derivative values are desired. |
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| 162 | |
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| 164 | |
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[234] | 168 | <h3>Examples</h3><pre> |
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[163] | 169 | IDL> y2 = spl_fstdrv(x, y, yscd, x2) |
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| 170 | |
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[234] | 171 | </pre><h3>Version history</h3> |
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[163] | 172 | |
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[234] | 173 | <h4>Version</h4> |
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[338] | 174 | $Id: spl_fstdrv.pro 325 2007-12-06 10:04:53Z pinsard $ |
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[163] | 175 | |
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| 176 | <h4>History</h4> |
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| 177 | Sebastien Masson (smasson@lodyc.jussieu.fr): May 2005 |
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| 195 | <font size="-3"><p> </p></font> |
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| 196 | <hr size="1" color="#CCCCCC"/> |
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[187] | 201 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0.</font></p> |
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[163] | 202 | |
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| 203 | </body> |
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[249] | 204 | </html> |
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