1 | /*************************************************************************
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2 | Copyright (c) 2007, Sergey Bochkanov (ALGLIB project).
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3 |
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4 | >>> SOURCE LICENSE >>>
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5 | This program is free software; you can redistribute it and/or modify
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6 | it under the terms of the GNU General Public License as published by
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7 | the Free Software Foundation (www.fsf.org); either version 2 of the
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8 | License, or (at your option) any later version.
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9 |
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10 | This program is distributed in the hope that it will be useful,
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | GNU General Public License for more details.
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14 |
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15 | A copy of the GNU General Public License is available at
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16 | http://www.fsf.org/licensing/licenses
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17 |
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18 | >>> END OF LICENSE >>>
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19 | *************************************************************************/
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20 |
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21 | using System;
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22 |
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23 | namespace alglib
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24 | {
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25 | public class spline2d
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26 | {
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27 | /*************************************************************************
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28 | 2-dimensional spline inteprolant
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29 | *************************************************************************/
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30 | public struct spline2dinterpolant
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31 | {
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32 | public int k;
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33 | public double[] c;
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34 | };
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35 |
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36 |
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37 |
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38 |
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39 | public const int spline2dvnum = 12;
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40 |
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41 |
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42 | /*************************************************************************
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43 | This subroutine builds bilinear spline coefficients table.
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44 |
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45 | Input parameters:
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46 | X - spline abscissas, array[0..N-1]
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47 | Y - spline ordinates, array[0..M-1]
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48 | F - function values, array[0..M-1,0..N-1]
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49 | M,N - grid size, M>=2, N>=2
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50 |
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51 | Output parameters:
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52 | C - spline interpolant
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53 |
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54 | -- ALGLIB PROJECT --
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55 | Copyright 05.07.2007 by Bochkanov Sergey
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56 | *************************************************************************/
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57 | public static void spline2dbuildbilinear(double[] x,
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58 | double[] y,
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59 | double[,] f,
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60 | int m,
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61 | int n,
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62 | ref spline2dinterpolant c)
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63 | {
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64 | int i = 0;
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65 | int j = 0;
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66 | int k = 0;
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67 | int tblsize = 0;
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68 | int shift = 0;
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69 | double t = 0;
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70 | double[,] dx = new double[0,0];
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71 | double[,] dy = new double[0,0];
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72 | double[,] dxy = new double[0,0];
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73 |
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74 | x = (double[])x.Clone();
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75 | y = (double[])y.Clone();
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76 | f = (double[,])f.Clone();
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77 |
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78 | System.Diagnostics.Debug.Assert(n>=2 & m>=2, "Spline2DBuildBilinear: N<2 or M<2!");
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79 |
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80 | //
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81 | // Sort points
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82 | //
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83 | for(j=0; j<=n-1; j++)
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84 | {
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85 | k = j;
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86 | for(i=j+1; i<=n-1; i++)
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87 | {
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88 | if( (double)(x[i])<(double)(x[k]) )
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89 | {
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90 | k = i;
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91 | }
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92 | }
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93 | if( k!=j )
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94 | {
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95 | for(i=0; i<=m-1; i++)
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96 | {
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97 | t = f[i,j];
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98 | f[i,j] = f[i,k];
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99 | f[i,k] = t;
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100 | }
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101 | t = x[j];
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102 | x[j] = x[k];
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103 | x[k] = t;
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104 | }
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105 | }
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106 | for(i=0; i<=m-1; i++)
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107 | {
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108 | k = i;
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109 | for(j=i+1; j<=m-1; j++)
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110 | {
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111 | if( (double)(y[j])<(double)(y[k]) )
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112 | {
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113 | k = j;
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114 | }
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115 | }
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116 | if( k!=i )
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117 | {
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118 | for(j=0; j<=n-1; j++)
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119 | {
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120 | t = f[i,j];
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121 | f[i,j] = f[k,j];
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122 | f[k,j] = t;
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123 | }
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124 | t = y[i];
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125 | y[i] = y[k];
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126 | y[k] = t;
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127 | }
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128 | }
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129 |
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130 | //
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131 | // Fill C:
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132 | // C[0] - length(C)
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133 | // C[1] - type(C):
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134 | // -1 = bilinear interpolant
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135 | // -3 = general cubic spline
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136 | // (see BuildBicubicSpline)
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137 | // C[2]:
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138 | // N (x count)
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139 | // C[3]:
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140 | // M (y count)
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141 | // C[4]...C[4+N-1]:
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142 | // x[i], i = 0...N-1
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143 | // C[4+N]...C[4+N+M-1]:
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144 | // y[i], i = 0...M-1
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145 | // C[4+N+M]...C[4+N+M+(N*M-1)]:
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146 | // f(i,j) table. f(0,0), f(0, 1), f(0,2) and so on...
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147 | //
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148 | c.k = 1;
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149 | tblsize = 4+n+m+n*m;
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150 | c.c = new double[tblsize-1+1];
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151 | c.c[0] = tblsize;
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152 | c.c[1] = -1;
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153 | c.c[2] = n;
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154 | c.c[3] = m;
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155 | for(i=0; i<=n-1; i++)
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156 | {
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157 | c.c[4+i] = x[i];
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158 | }
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159 | for(i=0; i<=m-1; i++)
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160 | {
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161 | c.c[4+n+i] = y[i];
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162 | }
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163 | for(i=0; i<=m-1; i++)
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164 | {
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165 | for(j=0; j<=n-1; j++)
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166 | {
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167 | shift = i*n+j;
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168 | c.c[4+n+m+shift] = f[i,j];
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169 | }
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170 | }
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171 | }
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172 |
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173 |
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174 | /*************************************************************************
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175 | This subroutine builds bicubic spline coefficients table.
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176 |
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177 | Input parameters:
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178 | X - spline abscissas, array[0..N-1]
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179 | Y - spline ordinates, array[0..M-1]
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180 | F - function values, array[0..M-1,0..N-1]
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181 | M,N - grid size, M>=2, N>=2
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182 |
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183 | Output parameters:
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184 | C - spline interpolant
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185 |
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186 | -- ALGLIB PROJECT --
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187 | Copyright 05.07.2007 by Bochkanov Sergey
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188 | *************************************************************************/
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189 | public static void spline2dbuildbicubic(double[] x,
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190 | double[] y,
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191 | double[,] f,
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192 | int m,
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193 | int n,
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194 | ref spline2dinterpolant c)
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195 | {
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196 | int i = 0;
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197 | int j = 0;
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198 | int k = 0;
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199 | int tblsize = 0;
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200 | int shift = 0;
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201 | double t = 0;
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202 | double[,] dx = new double[0,0];
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203 | double[,] dy = new double[0,0];
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204 | double[,] dxy = new double[0,0];
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205 |
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206 | x = (double[])x.Clone();
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207 | y = (double[])y.Clone();
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208 | f = (double[,])f.Clone();
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209 |
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210 | System.Diagnostics.Debug.Assert(n>=2 & m>=2, "BuildBicubicSpline: N<2 or M<2!");
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211 |
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212 | //
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213 | // Sort points
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214 | //
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215 | for(j=0; j<=n-1; j++)
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216 | {
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217 | k = j;
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218 | for(i=j+1; i<=n-1; i++)
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219 | {
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220 | if( (double)(x[i])<(double)(x[k]) )
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221 | {
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222 | k = i;
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223 | }
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224 | }
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225 | if( k!=j )
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226 | {
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227 | for(i=0; i<=m-1; i++)
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228 | {
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229 | t = f[i,j];
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230 | f[i,j] = f[i,k];
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231 | f[i,k] = t;
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232 | }
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233 | t = x[j];
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234 | x[j] = x[k];
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235 | x[k] = t;
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236 | }
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237 | }
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238 | for(i=0; i<=m-1; i++)
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239 | {
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240 | k = i;
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241 | for(j=i+1; j<=m-1; j++)
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242 | {
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243 | if( (double)(y[j])<(double)(y[k]) )
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244 | {
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245 | k = j;
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246 | }
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247 | }
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248 | if( k!=i )
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249 | {
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250 | for(j=0; j<=n-1; j++)
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251 | {
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252 | t = f[i,j];
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253 | f[i,j] = f[k,j];
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254 | f[k,j] = t;
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255 | }
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256 | t = y[i];
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257 | y[i] = y[k];
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258 | y[k] = t;
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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 | // Fill C:
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264 | // C[0] - length(C)
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265 | // C[1] - type(C):
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266 | // -1 = bilinear interpolant
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267 | // (see BuildBilinearInterpolant)
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268 | // -3 = general cubic spline
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269 | // C[2]:
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270 | // N (x count)
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271 | // C[3]:
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272 | // M (y count)
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273 | // C[4]...C[4+N-1]:
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274 | // x[i], i = 0...N-1
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275 | // C[4+N]...C[4+N+M-1]:
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276 | // y[i], i = 0...M-1
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277 | // C[4+N+M]...C[4+N+M+(N*M-1)]:
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278 | // f(i,j) table. f(0,0), f(0, 1), f(0,2) and so on...
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279 | // C[4+N+M+N*M]...C[4+N+M+(2*N*M-1)]:
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280 | // df(i,j)/dx table.
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281 | // C[4+N+M+2*N*M]...C[4+N+M+(3*N*M-1)]:
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282 | // df(i,j)/dy table.
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283 | // C[4+N+M+3*N*M]...C[4+N+M+(4*N*M-1)]:
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284 | // d2f(i,j)/dxdy table.
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285 | //
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286 | c.k = 3;
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287 | tblsize = 4+n+m+4*n*m;
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288 | c.c = new double[tblsize-1+1];
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289 | c.c[0] = tblsize;
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290 | c.c[1] = -3;
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291 | c.c[2] = n;
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292 | c.c[3] = m;
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293 | for(i=0; i<=n-1; i++)
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294 | {
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295 | c.c[4+i] = x[i];
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296 | }
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297 | for(i=0; i<=m-1; i++)
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298 | {
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299 | c.c[4+n+i] = y[i];
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300 | }
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301 | bicubiccalcderivatives(ref f, ref x, ref y, m, n, ref dx, ref dy, ref dxy);
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302 | for(i=0; i<=m-1; i++)
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303 | {
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304 | for(j=0; j<=n-1; j++)
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305 | {
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306 | shift = i*n+j;
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307 | c.c[4+n+m+shift] = f[i,j];
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308 | c.c[4+n+m+n*m+shift] = dx[i,j];
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309 | c.c[4+n+m+2*n*m+shift] = dy[i,j];
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310 | c.c[4+n+m+3*n*m+shift] = dxy[i,j];
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311 | }
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312 | }
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313 | }
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314 |
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315 |
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316 | /*************************************************************************
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317 | This subroutine calculates the value of the bilinear or bicubic spline at
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318 | the given point X.
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319 |
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320 | Input parameters:
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321 | C - coefficients table.
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322 | Built by BuildBilinearSpline or BuildBicubicSpline.
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323 | X, Y- point
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324 |
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325 | Result:
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326 | S(x,y)
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327 |
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328 | -- ALGLIB PROJECT --
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329 | Copyright 05.07.2007 by Bochkanov Sergey
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330 | *************************************************************************/
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331 | public static double spline2dcalc(ref spline2dinterpolant c,
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332 | double x,
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333 | double y)
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334 | {
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335 | double result = 0;
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336 | double v = 0;
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337 | double vx = 0;
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338 | double vy = 0;
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339 | double vxy = 0;
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340 |
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341 | spline2ddiff(ref c, x, y, ref v, ref vx, ref vy, ref vxy);
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342 | result = v;
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343 | return result;
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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 | This subroutine calculates the value of the bilinear or bicubic spline at
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349 | the given point X and its derivatives.
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350 |
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351 | Input parameters:
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352 | C - spline interpolant.
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353 | X, Y- point
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354 |
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355 | Output parameters:
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356 | F - S(x,y)
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357 | FX - dS(x,y)/dX
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358 | FY - dS(x,y)/dY
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359 | FXY - d2S(x,y)/dXdY
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360 |
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361 | -- ALGLIB PROJECT --
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362 | Copyright 05.07.2007 by Bochkanov Sergey
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363 | *************************************************************************/
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364 | public static void spline2ddiff(ref spline2dinterpolant c,
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365 | double x,
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366 | double y,
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367 | ref double f,
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368 | ref double fx,
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369 | ref double fy,
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370 | ref double fxy)
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371 | {
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372 | int n = 0;
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373 | int m = 0;
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374 | double t = 0;
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375 | double dt = 0;
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376 | double u = 0;
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377 | double du = 0;
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378 | int ix = 0;
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379 | int iy = 0;
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380 | int l = 0;
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381 | int r = 0;
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382 | int h = 0;
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383 | int shift1 = 0;
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384 | int s1 = 0;
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385 | int s2 = 0;
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386 | int s3 = 0;
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387 | int s4 = 0;
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388 | int sf = 0;
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389 | int sfx = 0;
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390 | int sfy = 0;
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391 | int sfxy = 0;
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392 | double y1 = 0;
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393 | double y2 = 0;
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394 | double y3 = 0;
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395 | double y4 = 0;
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396 | double v = 0;
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397 | double t0 = 0;
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398 | double t1 = 0;
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399 | double t2 = 0;
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400 | double t3 = 0;
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401 | double u0 = 0;
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402 | double u1 = 0;
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403 | double u2 = 0;
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404 | double u3 = 0;
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405 |
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406 | System.Diagnostics.Debug.Assert((int)Math.Round(c.c[1])==-1 | (int)Math.Round(c.c[1])==-3, "Spline2DDiff: incorrect C!");
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407 | n = (int)Math.Round(c.c[2]);
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408 | m = (int)Math.Round(c.c[3]);
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409 |
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410 | //
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411 | // Binary search in the [ x[0], ..., x[n-2] ] (x[n-1] is not included)
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412 | //
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413 | l = 4;
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414 | r = 4+n-2+1;
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415 | while( l!=r-1 )
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416 | {
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417 | h = (l+r)/2;
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418 | if( (double)(c.c[h])>=(double)(x) )
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419 | {
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420 | r = h;
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421 | }
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422 | else
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423 | {
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424 | l = h;
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425 | }
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426 | }
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427 | t = (x-c.c[l])/(c.c[l+1]-c.c[l]);
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428 | dt = 1.0/(c.c[l+1]-c.c[l]);
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429 | ix = l-4;
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430 |
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431 | //
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432 | // Binary search in the [ y[0], ..., y[m-2] ] (y[m-1] is not included)
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433 | //
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434 | l = 4+n;
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435 | r = 4+n+(m-2)+1;
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436 | while( l!=r-1 )
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437 | {
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438 | h = (l+r)/2;
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439 | if( (double)(c.c[h])>=(double)(y) )
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440 | {
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441 | r = h;
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442 | }
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443 | else
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444 | {
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445 | l = h;
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446 | }
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447 | }
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448 | u = (y-c.c[l])/(c.c[l+1]-c.c[l]);
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449 | du = 1.0/(c.c[l+1]-c.c[l]);
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450 | iy = l-(4+n);
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451 |
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452 | //
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453 | // Prepare F, dF/dX, dF/dY, d2F/dXdY
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454 | //
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455 | f = 0;
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456 | fx = 0;
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457 | fy = 0;
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458 | fxy = 0;
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459 |
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460 | //
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461 | // Bilinear interpolation
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462 | //
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463 | if( (int)Math.Round(c.c[1])==-1 )
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464 | {
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465 | shift1 = 4+n+m;
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466 | y1 = c.c[shift1+n*iy+ix];
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467 | y2 = c.c[shift1+n*iy+(ix+1)];
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468 | y3 = c.c[shift1+n*(iy+1)+(ix+1)];
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469 | y4 = c.c[shift1+n*(iy+1)+ix];
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470 | f = (1-t)*(1-u)*y1+t*(1-u)*y2+t*u*y3+(1-t)*u*y4;
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471 | fx = (-((1-u)*y1)+(1-u)*y2+u*y3-u*y4)*dt;
|
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472 | fy = (-((1-t)*y1)-t*y2+t*y3+(1-t)*y4)*du;
|
---|
473 | fxy = (y1-y2+y3-y4)*du*dt;
|
---|
474 | return;
|
---|
475 | }
|
---|
476 |
|
---|
477 | //
|
---|
478 | // Bicubic interpolation
|
---|
479 | //
|
---|
480 | if( (int)Math.Round(c.c[1])==-3 )
|
---|
481 | {
|
---|
482 |
|
---|
483 | //
|
---|
484 | // Prepare info
|
---|
485 | //
|
---|
486 | t0 = 1;
|
---|
487 | t1 = t;
|
---|
488 | t2 = AP.Math.Sqr(t);
|
---|
489 | t3 = t*t2;
|
---|
490 | u0 = 1;
|
---|
491 | u1 = u;
|
---|
492 | u2 = AP.Math.Sqr(u);
|
---|
493 | u3 = u*u2;
|
---|
494 | sf = 4+n+m;
|
---|
495 | sfx = 4+n+m+n*m;
|
---|
496 | sfy = 4+n+m+2*n*m;
|
---|
497 | sfxy = 4+n+m+3*n*m;
|
---|
498 | s1 = n*iy+ix;
|
---|
499 | s2 = n*iy+(ix+1);
|
---|
500 | s3 = n*(iy+1)+(ix+1);
|
---|
501 | s4 = n*(iy+1)+ix;
|
---|
502 |
|
---|
503 | //
|
---|
504 | // Calculate
|
---|
505 | //
|
---|
506 | v = +(1*c.c[sf+s1]);
|
---|
507 | f = f+v*t0*u0;
|
---|
508 | v = +(1*c.c[sfy+s1]/du);
|
---|
509 | f = f+v*t0*u1;
|
---|
510 | fy = fy+1*v*t0*u0*du;
|
---|
511 | v = -(3*c.c[sf+s1])+3*c.c[sf+s4]-2*c.c[sfy+s1]/du-1*c.c[sfy+s4]/du;
|
---|
512 | f = f+v*t0*u2;
|
---|
513 | fy = fy+2*v*t0*u1*du;
|
---|
514 | v = +(2*c.c[sf+s1])-2*c.c[sf+s4]+1*c.c[sfy+s1]/du+1*c.c[sfy+s4]/du;
|
---|
515 | f = f+v*t0*u3;
|
---|
516 | fy = fy+3*v*t0*u2*du;
|
---|
517 | v = +(1*c.c[sfx+s1]/dt);
|
---|
518 | f = f+v*t1*u0;
|
---|
519 | fx = fx+1*v*t0*u0*dt;
|
---|
520 | v = +(1*c.c[sfxy+s1]/(dt*du));
|
---|
521 | f = f+v*t1*u1;
|
---|
522 | fx = fx+1*v*t0*u1*dt;
|
---|
523 | fy = fy+1*v*t1*u0*du;
|
---|
524 | fxy = fxy+1*v*t0*u0*dt*du;
|
---|
525 | v = -(3*c.c[sfx+s1]/dt)+3*c.c[sfx+s4]/dt-2*c.c[sfxy+s1]/(dt*du)-1*c.c[sfxy+s4]/(dt*du);
|
---|
526 | f = f+v*t1*u2;
|
---|
527 | fx = fx+1*v*t0*u2*dt;
|
---|
528 | fy = fy+2*v*t1*u1*du;
|
---|
529 | fxy = fxy+2*v*t0*u1*dt*du;
|
---|
530 | v = +(2*c.c[sfx+s1]/dt)-2*c.c[sfx+s4]/dt+1*c.c[sfxy+s1]/(dt*du)+1*c.c[sfxy+s4]/(dt*du);
|
---|
531 | f = f+v*t1*u3;
|
---|
532 | fx = fx+1*v*t0*u3*dt;
|
---|
533 | fy = fy+3*v*t1*u2*du;
|
---|
534 | fxy = fxy+3*v*t0*u2*dt*du;
|
---|
535 | v = -(3*c.c[sf+s1])+3*c.c[sf+s2]-2*c.c[sfx+s1]/dt-1*c.c[sfx+s2]/dt;
|
---|
536 | f = f+v*t2*u0;
|
---|
537 | fx = fx+2*v*t1*u0*dt;
|
---|
538 | v = -(3*c.c[sfy+s1]/du)+3*c.c[sfy+s2]/du-2*c.c[sfxy+s1]/(dt*du)-1*c.c[sfxy+s2]/(dt*du);
|
---|
539 | f = f+v*t2*u1;
|
---|
540 | fx = fx+2*v*t1*u1*dt;
|
---|
541 | fy = fy+1*v*t2*u0*du;
|
---|
542 | fxy = fxy+2*v*t1*u0*dt*du;
|
---|
543 | v = +(9*c.c[sf+s1])-9*c.c[sf+s2]+9*c.c[sf+s3]-9*c.c[sf+s4]+6*c.c[sfx+s1]/dt+3*c.c[sfx+s2]/dt-3*c.c[sfx+s3]/dt-6*c.c[sfx+s4]/dt+6*c.c[sfy+s1]/du-6*c.c[sfy+s2]/du-3*c.c[sfy+s3]/du+3*c.c[sfy+s4]/du+4*c.c[sfxy+s1]/(dt*du)+2*c.c[sfxy+s2]/(dt*du)+1*c.c[sfxy+s3]/(dt*du)+2*c.c[sfxy+s4]/(dt*du);
|
---|
544 | f = f+v*t2*u2;
|
---|
545 | fx = fx+2*v*t1*u2*dt;
|
---|
546 | fy = fy+2*v*t2*u1*du;
|
---|
547 | fxy = fxy+4*v*t1*u1*dt*du;
|
---|
548 | v = -(6*c.c[sf+s1])+6*c.c[sf+s2]-6*c.c[sf+s3]+6*c.c[sf+s4]-4*c.c[sfx+s1]/dt-2*c.c[sfx+s2]/dt+2*c.c[sfx+s3]/dt+4*c.c[sfx+s4]/dt-3*c.c[sfy+s1]/du+3*c.c[sfy+s2]/du+3*c.c[sfy+s3]/du-3*c.c[sfy+s4]/du-2*c.c[sfxy+s1]/(dt*du)-1*c.c[sfxy+s2]/(dt*du)-1*c.c[sfxy+s3]/(dt*du)-2*c.c[sfxy+s4]/(dt*du);
|
---|
549 | f = f+v*t2*u3;
|
---|
550 | fx = fx+2*v*t1*u3*dt;
|
---|
551 | fy = fy+3*v*t2*u2*du;
|
---|
552 | fxy = fxy+6*v*t1*u2*dt*du;
|
---|
553 | v = +(2*c.c[sf+s1])-2*c.c[sf+s2]+1*c.c[sfx+s1]/dt+1*c.c[sfx+s2]/dt;
|
---|
554 | f = f+v*t3*u0;
|
---|
555 | fx = fx+3*v*t2*u0*dt;
|
---|
556 | v = +(2*c.c[sfy+s1]/du)-2*c.c[sfy+s2]/du+1*c.c[sfxy+s1]/(dt*du)+1*c.c[sfxy+s2]/(dt*du);
|
---|
557 | f = f+v*t3*u1;
|
---|
558 | fx = fx+3*v*t2*u1*dt;
|
---|
559 | fy = fy+1*v*t3*u0*du;
|
---|
560 | fxy = fxy+3*v*t2*u0*dt*du;
|
---|
561 | v = -(6*c.c[sf+s1])+6*c.c[sf+s2]-6*c.c[sf+s3]+6*c.c[sf+s4]-3*c.c[sfx+s1]/dt-3*c.c[sfx+s2]/dt+3*c.c[sfx+s3]/dt+3*c.c[sfx+s4]/dt-4*c.c[sfy+s1]/du+4*c.c[sfy+s2]/du+2*c.c[sfy+s3]/du-2*c.c[sfy+s4]/du-2*c.c[sfxy+s1]/(dt*du)-2*c.c[sfxy+s2]/(dt*du)-1*c.c[sfxy+s3]/(dt*du)-1*c.c[sfxy+s4]/(dt*du);
|
---|
562 | f = f+v*t3*u2;
|
---|
563 | fx = fx+3*v*t2*u2*dt;
|
---|
564 | fy = fy+2*v*t3*u1*du;
|
---|
565 | fxy = fxy+6*v*t2*u1*dt*du;
|
---|
566 | v = +(4*c.c[sf+s1])-4*c.c[sf+s2]+4*c.c[sf+s3]-4*c.c[sf+s4]+2*c.c[sfx+s1]/dt+2*c.c[sfx+s2]/dt-2*c.c[sfx+s3]/dt-2*c.c[sfx+s4]/dt+2*c.c[sfy+s1]/du-2*c.c[sfy+s2]/du-2*c.c[sfy+s3]/du+2*c.c[sfy+s4]/du+1*c.c[sfxy+s1]/(dt*du)+1*c.c[sfxy+s2]/(dt*du)+1*c.c[sfxy+s3]/(dt*du)+1*c.c[sfxy+s4]/(dt*du);
|
---|
567 | f = f+v*t3*u3;
|
---|
568 | fx = fx+3*v*t2*u3*dt;
|
---|
569 | fy = fy+3*v*t3*u2*du;
|
---|
570 | fxy = fxy+9*v*t2*u2*dt*du;
|
---|
571 | return;
|
---|
572 | }
|
---|
573 | }
|
---|
574 |
|
---|
575 |
|
---|
576 | /*************************************************************************
|
---|
577 | This subroutine unpacks two-dimensional spline into the coefficients table
|
---|
578 |
|
---|
579 | Input parameters:
|
---|
580 | C - spline interpolant.
|
---|
581 |
|
---|
582 | Result:
|
---|
583 | M, N- grid size (x-axis and y-axis)
|
---|
584 | Tbl - coefficients table, unpacked format,
|
---|
585 | [0..(N-1)*(M-1)-1, 0..19].
|
---|
586 | For I = 0...M-2, J=0..N-2:
|
---|
587 | K = I*(N-1)+J
|
---|
588 | Tbl[K,0] = X[j]
|
---|
589 | Tbl[K,1] = X[j+1]
|
---|
590 | Tbl[K,2] = Y[i]
|
---|
591 | Tbl[K,3] = Y[i+1]
|
---|
592 | Tbl[K,4] = C00
|
---|
593 | Tbl[K,5] = C01
|
---|
594 | Tbl[K,6] = C02
|
---|
595 | Tbl[K,7] = C03
|
---|
596 | Tbl[K,8] = C10
|
---|
597 | Tbl[K,9] = C11
|
---|
598 | ...
|
---|
599 | Tbl[K,19] = C33
|
---|
600 | On each grid square spline is equals to:
|
---|
601 | S(x) = SUM(c[i,j]*(x^i)*(y^j), i=0..3, j=0..3)
|
---|
602 | t = x-x[j]
|
---|
603 | u = y-y[i]
|
---|
604 |
|
---|
605 | -- ALGLIB PROJECT --
|
---|
606 | Copyright 29.06.2007 by Bochkanov Sergey
|
---|
607 | *************************************************************************/
|
---|
608 | public static void spline2dunpack(ref spline2dinterpolant c,
|
---|
609 | ref int m,
|
---|
610 | ref int n,
|
---|
611 | ref double[,] tbl)
|
---|
612 | {
|
---|
613 | int i = 0;
|
---|
614 | int j = 0;
|
---|
615 | int ci = 0;
|
---|
616 | int cj = 0;
|
---|
617 | int k = 0;
|
---|
618 | int p = 0;
|
---|
619 | int shift = 0;
|
---|
620 | int s1 = 0;
|
---|
621 | int s2 = 0;
|
---|
622 | int s3 = 0;
|
---|
623 | int s4 = 0;
|
---|
624 | int sf = 0;
|
---|
625 | int sfx = 0;
|
---|
626 | int sfy = 0;
|
---|
627 | int sfxy = 0;
|
---|
628 | double y1 = 0;
|
---|
629 | double y2 = 0;
|
---|
630 | double y3 = 0;
|
---|
631 | double y4 = 0;
|
---|
632 | double dt = 0;
|
---|
633 | double du = 0;
|
---|
634 |
|
---|
635 | System.Diagnostics.Debug.Assert((int)Math.Round(c.c[1])==-3 | (int)Math.Round(c.c[1])==-1, "SplineUnpack2D: incorrect C!");
|
---|
636 | n = (int)Math.Round(c.c[2]);
|
---|
637 | m = (int)Math.Round(c.c[3]);
|
---|
638 | tbl = new double[(n-1)*(m-1)-1+1, 19+1];
|
---|
639 |
|
---|
640 | //
|
---|
641 | // Fill
|
---|
642 | //
|
---|
643 | for(i=0; i<=m-2; i++)
|
---|
644 | {
|
---|
645 | for(j=0; j<=n-2; j++)
|
---|
646 | {
|
---|
647 | p = i*(n-1)+j;
|
---|
648 | tbl[p,0] = c.c[4+j];
|
---|
649 | tbl[p,1] = c.c[4+j+1];
|
---|
650 | tbl[p,2] = c.c[4+n+i];
|
---|
651 | tbl[p,3] = c.c[4+n+i+1];
|
---|
652 | dt = 1/(tbl[p,1]-tbl[p,0]);
|
---|
653 | du = 1/(tbl[p,3]-tbl[p,2]);
|
---|
654 |
|
---|
655 | //
|
---|
656 | // Bilinear interpolation
|
---|
657 | //
|
---|
658 | if( (int)Math.Round(c.c[1])==-1 )
|
---|
659 | {
|
---|
660 | for(k=4; k<=19; k++)
|
---|
661 | {
|
---|
662 | tbl[p,k] = 0;
|
---|
663 | }
|
---|
664 | shift = 4+n+m;
|
---|
665 | y1 = c.c[shift+n*i+j];
|
---|
666 | y2 = c.c[shift+n*i+(j+1)];
|
---|
667 | y3 = c.c[shift+n*(i+1)+(j+1)];
|
---|
668 | y4 = c.c[shift+n*(i+1)+j];
|
---|
669 | tbl[p,4] = y1;
|
---|
670 | tbl[p,4+1*4+0] = y2-y1;
|
---|
671 | tbl[p,4+0*4+1] = y4-y1;
|
---|
672 | tbl[p,4+1*4+1] = y3-y2-y4+y1;
|
---|
673 | }
|
---|
674 |
|
---|
675 | //
|
---|
676 | // Bicubic interpolation
|
---|
677 | //
|
---|
678 | if( (int)Math.Round(c.c[1])==-3 )
|
---|
679 | {
|
---|
680 | sf = 4+n+m;
|
---|
681 | sfx = 4+n+m+n*m;
|
---|
682 | sfy = 4+n+m+2*n*m;
|
---|
683 | sfxy = 4+n+m+3*n*m;
|
---|
684 | s1 = n*i+j;
|
---|
685 | s2 = n*i+(j+1);
|
---|
686 | s3 = n*(i+1)+(j+1);
|
---|
687 | s4 = n*(i+1)+j;
|
---|
688 | tbl[p,4+0*4+0] = +(1*c.c[sf+s1]);
|
---|
689 | tbl[p,4+0*4+1] = +(1*c.c[sfy+s1]/du);
|
---|
690 | tbl[p,4+0*4+2] = -(3*c.c[sf+s1])+3*c.c[sf+s4]-2*c.c[sfy+s1]/du-1*c.c[sfy+s4]/du;
|
---|
691 | tbl[p,4+0*4+3] = +(2*c.c[sf+s1])-2*c.c[sf+s4]+1*c.c[sfy+s1]/du+1*c.c[sfy+s4]/du;
|
---|
692 | tbl[p,4+1*4+0] = +(1*c.c[sfx+s1]/dt);
|
---|
693 | tbl[p,4+1*4+1] = +(1*c.c[sfxy+s1]/(dt*du));
|
---|
694 | tbl[p,4+1*4+2] = -(3*c.c[sfx+s1]/dt)+3*c.c[sfx+s4]/dt-2*c.c[sfxy+s1]/(dt*du)-1*c.c[sfxy+s4]/(dt*du);
|
---|
695 | tbl[p,4+1*4+3] = +(2*c.c[sfx+s1]/dt)-2*c.c[sfx+s4]/dt+1*c.c[sfxy+s1]/(dt*du)+1*c.c[sfxy+s4]/(dt*du);
|
---|
696 | tbl[p,4+2*4+0] = -(3*c.c[sf+s1])+3*c.c[sf+s2]-2*c.c[sfx+s1]/dt-1*c.c[sfx+s2]/dt;
|
---|
697 | tbl[p,4+2*4+1] = -(3*c.c[sfy+s1]/du)+3*c.c[sfy+s2]/du-2*c.c[sfxy+s1]/(dt*du)-1*c.c[sfxy+s2]/(dt*du);
|
---|
698 | tbl[p,4+2*4+2] = +(9*c.c[sf+s1])-9*c.c[sf+s2]+9*c.c[sf+s3]-9*c.c[sf+s4]+6*c.c[sfx+s1]/dt+3*c.c[sfx+s2]/dt-3*c.c[sfx+s3]/dt-6*c.c[sfx+s4]/dt+6*c.c[sfy+s1]/du-6*c.c[sfy+s2]/du-3*c.c[sfy+s3]/du+3*c.c[sfy+s4]/du+4*c.c[sfxy+s1]/(dt*du)+2*c.c[sfxy+s2]/(dt*du)+1*c.c[sfxy+s3]/(dt*du)+2*c.c[sfxy+s4]/(dt*du);
|
---|
699 | tbl[p,4+2*4+3] = -(6*c.c[sf+s1])+6*c.c[sf+s2]-6*c.c[sf+s3]+6*c.c[sf+s4]-4*c.c[sfx+s1]/dt-2*c.c[sfx+s2]/dt+2*c.c[sfx+s3]/dt+4*c.c[sfx+s4]/dt-3*c.c[sfy+s1]/du+3*c.c[sfy+s2]/du+3*c.c[sfy+s3]/du-3*c.c[sfy+s4]/du-2*c.c[sfxy+s1]/(dt*du)-1*c.c[sfxy+s2]/(dt*du)-1*c.c[sfxy+s3]/(dt*du)-2*c.c[sfxy+s4]/(dt*du);
|
---|
700 | tbl[p,4+3*4+0] = +(2*c.c[sf+s1])-2*c.c[sf+s2]+1*c.c[sfx+s1]/dt+1*c.c[sfx+s2]/dt;
|
---|
701 | tbl[p,4+3*4+1] = +(2*c.c[sfy+s1]/du)-2*c.c[sfy+s2]/du+1*c.c[sfxy+s1]/(dt*du)+1*c.c[sfxy+s2]/(dt*du);
|
---|
702 | tbl[p,4+3*4+2] = -(6*c.c[sf+s1])+6*c.c[sf+s2]-6*c.c[sf+s3]+6*c.c[sf+s4]-3*c.c[sfx+s1]/dt-3*c.c[sfx+s2]/dt+3*c.c[sfx+s3]/dt+3*c.c[sfx+s4]/dt-4*c.c[sfy+s1]/du+4*c.c[sfy+s2]/du+2*c.c[sfy+s3]/du-2*c.c[sfy+s4]/du-2*c.c[sfxy+s1]/(dt*du)-2*c.c[sfxy+s2]/(dt*du)-1*c.c[sfxy+s3]/(dt*du)-1*c.c[sfxy+s4]/(dt*du);
|
---|
703 | tbl[p,4+3*4+3] = +(4*c.c[sf+s1])-4*c.c[sf+s2]+4*c.c[sf+s3]-4*c.c[sf+s4]+2*c.c[sfx+s1]/dt+2*c.c[sfx+s2]/dt-2*c.c[sfx+s3]/dt-2*c.c[sfx+s4]/dt+2*c.c[sfy+s1]/du-2*c.c[sfy+s2]/du-2*c.c[sfy+s3]/du+2*c.c[sfy+s4]/du+1*c.c[sfxy+s1]/(dt*du)+1*c.c[sfxy+s2]/(dt*du)+1*c.c[sfxy+s3]/(dt*du)+1*c.c[sfxy+s4]/(dt*du);
|
---|
704 | }
|
---|
705 |
|
---|
706 | //
|
---|
707 | // Rescale Cij
|
---|
708 | //
|
---|
709 | for(ci=0; ci<=3; ci++)
|
---|
710 | {
|
---|
711 | for(cj=0; cj<=3; cj++)
|
---|
712 | {
|
---|
713 | tbl[p,4+ci*4+cj] = tbl[p,4+ci*4+cj]*Math.Pow(dt, ci)*Math.Pow(du, cj);
|
---|
714 | }
|
---|
715 | }
|
---|
716 | }
|
---|
717 | }
|
---|
718 | }
|
---|
719 |
|
---|
720 |
|
---|
721 | /*************************************************************************
|
---|
722 | This subroutine performs linear transformation of the spline argument.
|
---|
723 |
|
---|
724 | Input parameters:
|
---|
725 | C - spline interpolant
|
---|
726 | AX, BX - transformation coefficients: x = A*t + B
|
---|
727 | AY, BY - transformation coefficients: y = A*u + B
|
---|
728 | Result:
|
---|
729 | C - transformed spline
|
---|
730 |
|
---|
731 | -- ALGLIB PROJECT --
|
---|
732 | Copyright 30.06.2007 by Bochkanov Sergey
|
---|
733 | *************************************************************************/
|
---|
734 | public static void spline2dlintransxy(ref spline2dinterpolant c,
|
---|
735 | double ax,
|
---|
736 | double bx,
|
---|
737 | double ay,
|
---|
738 | double by)
|
---|
739 | {
|
---|
740 | int i = 0;
|
---|
741 | int j = 0;
|
---|
742 | int n = 0;
|
---|
743 | int m = 0;
|
---|
744 | double v = 0;
|
---|
745 | double[] x = new double[0];
|
---|
746 | double[] y = new double[0];
|
---|
747 | double[,] f = new double[0,0];
|
---|
748 | int typec = 0;
|
---|
749 |
|
---|
750 | typec = (int)Math.Round(c.c[1]);
|
---|
751 | System.Diagnostics.Debug.Assert(typec==-3 | typec==-1, "Spline2DLinTransXY: incorrect C!");
|
---|
752 | n = (int)Math.Round(c.c[2]);
|
---|
753 | m = (int)Math.Round(c.c[3]);
|
---|
754 | x = new double[n-1+1];
|
---|
755 | y = new double[m-1+1];
|
---|
756 | f = new double[m-1+1, n-1+1];
|
---|
757 | for(j=0; j<=n-1; j++)
|
---|
758 | {
|
---|
759 | x[j] = c.c[4+j];
|
---|
760 | }
|
---|
761 | for(i=0; i<=m-1; i++)
|
---|
762 | {
|
---|
763 | y[i] = c.c[4+n+i];
|
---|
764 | }
|
---|
765 | for(i=0; i<=m-1; i++)
|
---|
766 | {
|
---|
767 | for(j=0; j<=n-1; j++)
|
---|
768 | {
|
---|
769 | f[i,j] = c.c[4+n+m+i*n+j];
|
---|
770 | }
|
---|
771 | }
|
---|
772 |
|
---|
773 | //
|
---|
774 | // Special case: AX=0 or AY=0
|
---|
775 | //
|
---|
776 | if( (double)(ax)==(double)(0) )
|
---|
777 | {
|
---|
778 | for(i=0; i<=m-1; i++)
|
---|
779 | {
|
---|
780 | v = spline2dcalc(ref c, bx, y[i]);
|
---|
781 | for(j=0; j<=n-1; j++)
|
---|
782 | {
|
---|
783 | f[i,j] = v;
|
---|
784 | }
|
---|
785 | }
|
---|
786 | if( typec==-3 )
|
---|
787 | {
|
---|
788 | spline2dbuildbicubic(x, y, f, m, n, ref c);
|
---|
789 | }
|
---|
790 | if( typec==-1 )
|
---|
791 | {
|
---|
792 | spline2dbuildbilinear(x, y, f, m, n, ref c);
|
---|
793 | }
|
---|
794 | ax = 1;
|
---|
795 | bx = 0;
|
---|
796 | }
|
---|
797 | if( (double)(ay)==(double)(0) )
|
---|
798 | {
|
---|
799 | for(j=0; j<=n-1; j++)
|
---|
800 | {
|
---|
801 | v = spline2dcalc(ref c, x[j], by);
|
---|
802 | for(i=0; i<=m-1; i++)
|
---|
803 | {
|
---|
804 | f[i,j] = v;
|
---|
805 | }
|
---|
806 | }
|
---|
807 | if( typec==-3 )
|
---|
808 | {
|
---|
809 | spline2dbuildbicubic(x, y, f, m, n, ref c);
|
---|
810 | }
|
---|
811 | if( typec==-1 )
|
---|
812 | {
|
---|
813 | spline2dbuildbilinear(x, y, f, m, n, ref c);
|
---|
814 | }
|
---|
815 | ay = 1;
|
---|
816 | by = 0;
|
---|
817 | }
|
---|
818 |
|
---|
819 | //
|
---|
820 | // General case: AX<>0, AY<>0
|
---|
821 | // Unpack, scale and pack again.
|
---|
822 | //
|
---|
823 | for(j=0; j<=n-1; j++)
|
---|
824 | {
|
---|
825 | x[j] = (x[j]-bx)/ax;
|
---|
826 | }
|
---|
827 | for(i=0; i<=m-1; i++)
|
---|
828 | {
|
---|
829 | y[i] = (y[i]-by)/ay;
|
---|
830 | }
|
---|
831 | if( typec==-3 )
|
---|
832 | {
|
---|
833 | spline2dbuildbicubic(x, y, f, m, n, ref c);
|
---|
834 | }
|
---|
835 | if( typec==-1 )
|
---|
836 | {
|
---|
837 | spline2dbuildbilinear(x, y, f, m, n, ref c);
|
---|
838 | }
|
---|
839 | }
|
---|
840 |
|
---|
841 |
|
---|
842 | /*************************************************************************
|
---|
843 | This subroutine performs linear transformation of the spline.
|
---|
844 |
|
---|
845 | Input parameters:
|
---|
846 | C - spline interpolant.
|
---|
847 | A, B- transformation coefficients: S2(x,y) = A*S(x,y) + B
|
---|
848 |
|
---|
849 | Output parameters:
|
---|
850 | C - transformed spline
|
---|
851 |
|
---|
852 | -- ALGLIB PROJECT --
|
---|
853 | Copyright 30.06.2007 by Bochkanov Sergey
|
---|
854 | *************************************************************************/
|
---|
855 | public static void spline2dlintransf(ref spline2dinterpolant c,
|
---|
856 | double a,
|
---|
857 | double b)
|
---|
858 | {
|
---|
859 | int i = 0;
|
---|
860 | int j = 0;
|
---|
861 | int n = 0;
|
---|
862 | int m = 0;
|
---|
863 | double[] x = new double[0];
|
---|
864 | double[] y = new double[0];
|
---|
865 | double[,] f = new double[0,0];
|
---|
866 | int typec = 0;
|
---|
867 |
|
---|
868 | typec = (int)Math.Round(c.c[1]);
|
---|
869 | System.Diagnostics.Debug.Assert(typec==-3 | typec==-1, "Spline2DLinTransXY: incorrect C!");
|
---|
870 | n = (int)Math.Round(c.c[2]);
|
---|
871 | m = (int)Math.Round(c.c[3]);
|
---|
872 | x = new double[n-1+1];
|
---|
873 | y = new double[m-1+1];
|
---|
874 | f = new double[m-1+1, n-1+1];
|
---|
875 | for(j=0; j<=n-1; j++)
|
---|
876 | {
|
---|
877 | x[j] = c.c[4+j];
|
---|
878 | }
|
---|
879 | for(i=0; i<=m-1; i++)
|
---|
880 | {
|
---|
881 | y[i] = c.c[4+n+i];
|
---|
882 | }
|
---|
883 | for(i=0; i<=m-1; i++)
|
---|
884 | {
|
---|
885 | for(j=0; j<=n-1; j++)
|
---|
886 | {
|
---|
887 | f[i,j] = a*c.c[4+n+m+i*n+j]+b;
|
---|
888 | }
|
---|
889 | }
|
---|
890 | if( typec==-3 )
|
---|
891 | {
|
---|
892 | spline2dbuildbicubic(x, y, f, m, n, ref c);
|
---|
893 | }
|
---|
894 | if( typec==-1 )
|
---|
895 | {
|
---|
896 | spline2dbuildbilinear(x, y, f, m, n, ref c);
|
---|
897 | }
|
---|
898 | }
|
---|
899 |
|
---|
900 |
|
---|
901 | /*************************************************************************
|
---|
902 | This subroutine makes the copy of the spline model.
|
---|
903 |
|
---|
904 | Input parameters:
|
---|
905 | C - spline interpolant
|
---|
906 |
|
---|
907 | Output parameters:
|
---|
908 | CC - spline copy
|
---|
909 |
|
---|
910 | -- ALGLIB PROJECT --
|
---|
911 | Copyright 29.06.2007 by Bochkanov Sergey
|
---|
912 | *************************************************************************/
|
---|
913 | public static void spline2dcopy(ref spline2dinterpolant c,
|
---|
914 | ref spline2dinterpolant cc)
|
---|
915 | {
|
---|
916 | int n = 0;
|
---|
917 | int i_ = 0;
|
---|
918 |
|
---|
919 | System.Diagnostics.Debug.Assert(c.k==1 | c.k==3, "Spline2DCopy: incorrect C!");
|
---|
920 | cc.k = c.k;
|
---|
921 | n = (int)Math.Round(c.c[0]);
|
---|
922 | cc.c = new double[n];
|
---|
923 | for(i_=0; i_<=n-1;i_++)
|
---|
924 | {
|
---|
925 | cc.c[i_] = c.c[i_];
|
---|
926 | }
|
---|
927 | }
|
---|
928 |
|
---|
929 |
|
---|
930 | /*************************************************************************
|
---|
931 | Serialization of the spline interpolant
|
---|
932 |
|
---|
933 | INPUT PARAMETERS:
|
---|
934 | B - spline interpolant
|
---|
935 |
|
---|
936 | OUTPUT PARAMETERS:
|
---|
937 | RA - array of real numbers which contains interpolant,
|
---|
938 | array[0..RLen-1]
|
---|
939 | RLen - RA lenght
|
---|
940 |
|
---|
941 | -- ALGLIB --
|
---|
942 | Copyright 17.08.2009 by Bochkanov Sergey
|
---|
943 | *************************************************************************/
|
---|
944 | public static void spline2dserialize(ref spline2dinterpolant c,
|
---|
945 | ref double[] ra,
|
---|
946 | ref int ralen)
|
---|
947 | {
|
---|
948 | int clen = 0;
|
---|
949 | int i_ = 0;
|
---|
950 | int i1_ = 0;
|
---|
951 |
|
---|
952 | System.Diagnostics.Debug.Assert(c.k==1 | c.k==3, "Spline2DSerialize: incorrect C!");
|
---|
953 | clen = (int)Math.Round(c.c[0]);
|
---|
954 | ralen = 3+clen;
|
---|
955 | ra = new double[ralen];
|
---|
956 | ra[0] = ralen;
|
---|
957 | ra[1] = spline2dvnum;
|
---|
958 | ra[2] = c.k;
|
---|
959 | i1_ = (0) - (3);
|
---|
960 | for(i_=3; i_<=3+clen-1;i_++)
|
---|
961 | {
|
---|
962 | ra[i_] = c.c[i_+i1_];
|
---|
963 | }
|
---|
964 | }
|
---|
965 |
|
---|
966 |
|
---|
967 | /*************************************************************************
|
---|
968 | Unserialization of the spline interpolant
|
---|
969 |
|
---|
970 | INPUT PARAMETERS:
|
---|
971 | RA - array of real numbers which contains interpolant,
|
---|
972 |
|
---|
973 | OUTPUT PARAMETERS:
|
---|
974 | B - spline interpolant
|
---|
975 |
|
---|
976 | -- ALGLIB --
|
---|
977 | Copyright 17.08.2009 by Bochkanov Sergey
|
---|
978 | *************************************************************************/
|
---|
979 | public static void spline2dunserialize(ref double[] ra,
|
---|
980 | ref spline2dinterpolant c)
|
---|
981 | {
|
---|
982 | int clen = 0;
|
---|
983 | int i_ = 0;
|
---|
984 | int i1_ = 0;
|
---|
985 |
|
---|
986 | System.Diagnostics.Debug.Assert((int)Math.Round(ra[1])==spline2dvnum, "Spline2DUnserialize: corrupted array!");
|
---|
987 | c.k = (int)Math.Round(ra[2]);
|
---|
988 | clen = (int)Math.Round(ra[3]);
|
---|
989 | c.c = new double[clen];
|
---|
990 | i1_ = (3) - (0);
|
---|
991 | for(i_=0; i_<=clen-1;i_++)
|
---|
992 | {
|
---|
993 | c.c[i_] = ra[i_+i1_];
|
---|
994 | }
|
---|
995 | }
|
---|
996 |
|
---|
997 |
|
---|
998 | /*************************************************************************
|
---|
999 | Bicubic spline resampling
|
---|
1000 |
|
---|
1001 | Input parameters:
|
---|
1002 | A - function values at the old grid,
|
---|
1003 | array[0..OldHeight-1, 0..OldWidth-1]
|
---|
1004 | OldHeight - old grid height, OldHeight>1
|
---|
1005 | OldWidth - old grid width, OldWidth>1
|
---|
1006 | NewHeight - new grid height, NewHeight>1
|
---|
1007 | NewWidth - new grid width, NewWidth>1
|
---|
1008 |
|
---|
1009 | Output parameters:
|
---|
1010 | B - function values at the new grid,
|
---|
1011 | array[0..NewHeight-1, 0..NewWidth-1]
|
---|
1012 |
|
---|
1013 | -- ALGLIB routine --
|
---|
1014 | 15 May, 2007
|
---|
1015 | Copyright by Bochkanov Sergey
|
---|
1016 | *************************************************************************/
|
---|
1017 | public static void spline2dresamplebicubic(ref double[,] a,
|
---|
1018 | int oldheight,
|
---|
1019 | int oldwidth,
|
---|
1020 | ref double[,] b,
|
---|
1021 | int newheight,
|
---|
1022 | int newwidth)
|
---|
1023 | {
|
---|
1024 | double[,] buf = new double[0,0];
|
---|
1025 | double[] x = new double[0];
|
---|
1026 | double[] y = new double[0];
|
---|
1027 | spline1d.spline1dinterpolant c = new spline1d.spline1dinterpolant();
|
---|
1028 | int i = 0;
|
---|
1029 | int j = 0;
|
---|
1030 | int mw = 0;
|
---|
1031 | int mh = 0;
|
---|
1032 |
|
---|
1033 | System.Diagnostics.Debug.Assert(oldwidth>1 & oldheight>1, "Spline2DResampleBicubic: width/height less than 1");
|
---|
1034 | System.Diagnostics.Debug.Assert(newwidth>1 & newheight>1, "Spline2DResampleBicubic: width/height less than 1");
|
---|
1035 |
|
---|
1036 | //
|
---|
1037 | // Prepare
|
---|
1038 | //
|
---|
1039 | mw = Math.Max(oldwidth, newwidth);
|
---|
1040 | mh = Math.Max(oldheight, newheight);
|
---|
1041 | b = new double[newheight-1+1, newwidth-1+1];
|
---|
1042 | buf = new double[oldheight-1+1, newwidth-1+1];
|
---|
1043 | x = new double[Math.Max(mw, mh)-1+1];
|
---|
1044 | y = new double[Math.Max(mw, mh)-1+1];
|
---|
1045 |
|
---|
1046 | //
|
---|
1047 | // Horizontal interpolation
|
---|
1048 | //
|
---|
1049 | for(i=0; i<=oldheight-1; i++)
|
---|
1050 | {
|
---|
1051 |
|
---|
1052 | //
|
---|
1053 | // Fill X, Y
|
---|
1054 | //
|
---|
1055 | for(j=0; j<=oldwidth-1; j++)
|
---|
1056 | {
|
---|
1057 | x[j] = (double)(j)/((double)(oldwidth-1));
|
---|
1058 | y[j] = a[i,j];
|
---|
1059 | }
|
---|
1060 |
|
---|
1061 | //
|
---|
1062 | // Interpolate and place result into temporary matrix
|
---|
1063 | //
|
---|
1064 | spline1d.spline1dbuildcubic(x, y, oldwidth, 0, 0.0, 0, 0.0, ref c);
|
---|
1065 | for(j=0; j<=newwidth-1; j++)
|
---|
1066 | {
|
---|
1067 | buf[i,j] = spline1d.spline1dcalc(ref c, (double)(j)/((double)(newwidth-1)));
|
---|
1068 | }
|
---|
1069 | }
|
---|
1070 |
|
---|
1071 | //
|
---|
1072 | // Vertical interpolation
|
---|
1073 | //
|
---|
1074 | for(j=0; j<=newwidth-1; j++)
|
---|
1075 | {
|
---|
1076 |
|
---|
1077 | //
|
---|
1078 | // Fill X, Y
|
---|
1079 | //
|
---|
1080 | for(i=0; i<=oldheight-1; i++)
|
---|
1081 | {
|
---|
1082 | x[i] = (double)(i)/((double)(oldheight-1));
|
---|
1083 | y[i] = buf[i,j];
|
---|
1084 | }
|
---|
1085 |
|
---|
1086 | //
|
---|
1087 | // Interpolate and place result into B
|
---|
1088 | //
|
---|
1089 | spline1d.spline1dbuildcubic(x, y, oldheight, 0, 0.0, 0, 0.0, ref c);
|
---|
1090 | for(i=0; i<=newheight-1; i++)
|
---|
1091 | {
|
---|
1092 | b[i,j] = spline1d.spline1dcalc(ref c, (double)(i)/((double)(newheight-1)));
|
---|
1093 | }
|
---|
1094 | }
|
---|
1095 | }
|
---|
1096 |
|
---|
1097 |
|
---|
1098 | /*************************************************************************
|
---|
1099 | Bilinear spline resampling
|
---|
1100 |
|
---|
1101 | Input parameters:
|
---|
1102 | A - function values at the old grid,
|
---|
1103 | array[0..OldHeight-1, 0..OldWidth-1]
|
---|
1104 | OldHeight - old grid height, OldHeight>1
|
---|
1105 | OldWidth - old grid width, OldWidth>1
|
---|
1106 | NewHeight - new grid height, NewHeight>1
|
---|
1107 | NewWidth - new grid width, NewWidth>1
|
---|
1108 |
|
---|
1109 | Output parameters:
|
---|
1110 | B - function values at the new grid,
|
---|
1111 | array[0..NewHeight-1, 0..NewWidth-1]
|
---|
1112 |
|
---|
1113 | -- ALGLIB routine --
|
---|
1114 | 09.07.2007
|
---|
1115 | Copyright by Bochkanov Sergey
|
---|
1116 | *************************************************************************/
|
---|
1117 | public static void spline2dresamplebilinear(ref double[,] a,
|
---|
1118 | int oldheight,
|
---|
1119 | int oldwidth,
|
---|
1120 | ref double[,] b,
|
---|
1121 | int newheight,
|
---|
1122 | int newwidth)
|
---|
1123 | {
|
---|
1124 | int i = 0;
|
---|
1125 | int j = 0;
|
---|
1126 | int l = 0;
|
---|
1127 | int c = 0;
|
---|
1128 | double t = 0;
|
---|
1129 | double u = 0;
|
---|
1130 |
|
---|
1131 | b = new double[newheight-1+1, newwidth-1+1];
|
---|
1132 | for(i=0; i<=newheight-1; i++)
|
---|
1133 | {
|
---|
1134 | for(j=0; j<=newwidth-1; j++)
|
---|
1135 | {
|
---|
1136 | l = i*(oldheight-1)/(newheight-1);
|
---|
1137 | if( l==oldheight-1 )
|
---|
1138 | {
|
---|
1139 | l = oldheight-2;
|
---|
1140 | }
|
---|
1141 | u = (double)(i)/((double)(newheight-1))*(oldheight-1)-l;
|
---|
1142 | c = j*(oldwidth-1)/(newwidth-1);
|
---|
1143 | if( c==oldwidth-1 )
|
---|
1144 | {
|
---|
1145 | c = oldwidth-2;
|
---|
1146 | }
|
---|
1147 | t = (double)(j*(oldwidth-1))/((double)(newwidth-1))-c;
|
---|
1148 | b[i,j] = (1-t)*(1-u)*a[l,c]+t*(1-u)*a[l,c+1]+t*u*a[l+1,c+1]+(1-t)*u*a[l+1,c];
|
---|
1149 | }
|
---|
1150 | }
|
---|
1151 | }
|
---|
1152 |
|
---|
1153 |
|
---|
1154 | /*************************************************************************
|
---|
1155 | Internal subroutine.
|
---|
1156 | Calculation of the first derivatives and the cross-derivative.
|
---|
1157 | *************************************************************************/
|
---|
1158 | private static void bicubiccalcderivatives(ref double[,] a,
|
---|
1159 | ref double[] x,
|
---|
1160 | ref double[] y,
|
---|
1161 | int m,
|
---|
1162 | int n,
|
---|
1163 | ref double[,] dx,
|
---|
1164 | ref double[,] dy,
|
---|
1165 | ref double[,] dxy)
|
---|
1166 | {
|
---|
1167 | int i = 0;
|
---|
1168 | int j = 0;
|
---|
1169 | double[] xt = new double[0];
|
---|
1170 | double[] ft = new double[0];
|
---|
1171 | double[] c = new double[0];
|
---|
1172 | double s = 0;
|
---|
1173 | double ds = 0;
|
---|
1174 | double d2s = 0;
|
---|
1175 |
|
---|
1176 | dx = new double[m-1+1, n-1+1];
|
---|
1177 | dy = new double[m-1+1, n-1+1];
|
---|
1178 | dxy = new double[m-1+1, n-1+1];
|
---|
1179 |
|
---|
1180 | //
|
---|
1181 | // dF/dX
|
---|
1182 | //
|
---|
1183 | xt = new double[n-1+1];
|
---|
1184 | ft = new double[n-1+1];
|
---|
1185 | for(i=0; i<=m-1; i++)
|
---|
1186 | {
|
---|
1187 | for(j=0; j<=n-1; j++)
|
---|
1188 | {
|
---|
1189 | xt[j] = x[j];
|
---|
1190 | ft[j] = a[i,j];
|
---|
1191 | }
|
---|
1192 | spline3.buildcubicspline(xt, ft, n, 0, 0.0, 0, 0.0, ref c);
|
---|
1193 | for(j=0; j<=n-1; j++)
|
---|
1194 | {
|
---|
1195 | spline3.splinedifferentiation(ref c, x[j], ref s, ref ds, ref d2s);
|
---|
1196 | dx[i,j] = ds;
|
---|
1197 | }
|
---|
1198 | }
|
---|
1199 |
|
---|
1200 | //
|
---|
1201 | // dF/dY
|
---|
1202 | //
|
---|
1203 | xt = new double[m-1+1];
|
---|
1204 | ft = new double[m-1+1];
|
---|
1205 | for(j=0; j<=n-1; j++)
|
---|
1206 | {
|
---|
1207 | for(i=0; i<=m-1; i++)
|
---|
1208 | {
|
---|
1209 | xt[i] = y[i];
|
---|
1210 | ft[i] = a[i,j];
|
---|
1211 | }
|
---|
1212 | spline3.buildcubicspline(xt, ft, m, 0, 0.0, 0, 0.0, ref c);
|
---|
1213 | for(i=0; i<=m-1; i++)
|
---|
1214 | {
|
---|
1215 | spline3.splinedifferentiation(ref c, y[i], ref s, ref ds, ref d2s);
|
---|
1216 | dy[i,j] = ds;
|
---|
1217 | }
|
---|
1218 | }
|
---|
1219 |
|
---|
1220 | //
|
---|
1221 | // d2F/dXdY
|
---|
1222 | //
|
---|
1223 | xt = new double[n-1+1];
|
---|
1224 | ft = new double[n-1+1];
|
---|
1225 | for(i=0; i<=m-1; i++)
|
---|
1226 | {
|
---|
1227 | for(j=0; j<=n-1; j++)
|
---|
1228 | {
|
---|
1229 | xt[j] = x[j];
|
---|
1230 | ft[j] = dy[i,j];
|
---|
1231 | }
|
---|
1232 | spline3.buildcubicspline(xt, ft, n, 0, 0.0, 0, 0.0, ref c);
|
---|
1233 | for(j=0; j<=n-1; j++)
|
---|
1234 | {
|
---|
1235 | spline3.splinedifferentiation(ref c, x[j], ref s, ref ds, ref d2s);
|
---|
1236 | dxy[i,j] = ds;
|
---|
1237 | }
|
---|
1238 | }
|
---|
1239 | }
|
---|
1240 | }
|
---|
1241 | }
|
---|