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5 | <title>spl_fstdrv.pro (SAXO Documentation Assistant)</title> |
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46 | <tr> |
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47 | <td width="10%"> |
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48 | <a href="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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64 | SPL_FSTDRV returns the values of the first derivative of |
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65 | the interpolating function at the points X2i. it is a double |
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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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69 | AND Y[i] in ascending order), and given an input value X2, the |
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70 | SPL_INCR function returns an interpolated value for the given values |
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71 | 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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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 | |
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89 | y2: f'(x2) = y2. |
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90 | |
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91 | |
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92 | |
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93 | <h3>Parameters</h3> |
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94 | |
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95 | |
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96 | <a name="#_spl_fstdrv_keyword_x"></a> |
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97 | <h4>x |
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98 | <font size="-1" color="#006633">in</font> |
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99 | |
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100 | |
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101 | <font size="-1" color="#006633">required</font> |
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102 | |
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103 | |
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104 | |
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105 | |
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106 | </h4> |
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107 | |
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108 | |
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109 | An n-element (at least 2) input vector that specifies the |
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110 | tabulate points in ascending order. |
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111 | |
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112 | |
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113 | |
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114 | <a name="#_spl_fstdrv_keyword_y"></a> |
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115 | <h4>y |
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116 | <font size="-1" color="#006633">in</font> |
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117 | |
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118 | |
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119 | <font size="-1" color="#006633">required</font> |
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120 | |
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121 | |
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122 | |
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123 | |
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124 | </h4> |
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125 | |
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126 | |
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127 | f(x) = y. An n-element input vector that specifies the values |
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128 | of the tabulated function F(Xi) corresponding to Xi. |
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129 | |
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130 | |
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131 | |
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132 | <a name="#_spl_fstdrv_keyword_yscd"></a> |
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133 | <h4>yscd |
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134 | <font size="-1" color="#006633">in</font> |
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135 | |
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136 | |
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137 | <font size="-1" color="#006633">required</font> |
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138 | |
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139 | |
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140 | |
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141 | |
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142 | </h4> |
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143 | |
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144 | |
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145 | The output from SPL_INIT for the specified X and Y. |
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146 | |
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147 | |
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148 | |
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149 | <a name="#_spl_fstdrv_keyword_x2"></a> |
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150 | <h4>x2 |
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151 | <font size="-1" color="#006633">in</font> |
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152 | |
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153 | |
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154 | <font size="-1" color="#006633">required</font> |
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155 | |
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156 | |
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157 | |
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158 | |
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159 | </h4> |
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160 | |
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161 | |
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162 | The input values for which the first derivative values are desired. |
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163 | X can be scalar or an array of values. |
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164 | |
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165 | |
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166 | |
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167 | |
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168 | |
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169 | |
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170 | <h3>Examples</h3> |
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171 | IDL> y2 = spl_fstdrv(x, y, yscd, x2) |
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172 | |
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173 | <h3>Version history</h3> |
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174 | |
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175 | <h4>Version</h4> $Id: spl_fstdrv.pro 134 2006-07-07 10:19:08Z navarro $ |
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176 | |
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177 | <h4>History</h4> |
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178 | Sebastien Masson (smasson@lodyc.jussieu.fr): May 2005 |
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196 | <font size="-3"><p> </p></font> |
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197 | <hr size="1" color="#CCCCCC"/> |
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202 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0 on Tue Aug 29 14:49:20 2006.</font></p> |
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203 | |
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204 | </body> |
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205 | </html> |
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