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1 // tc-fsolve.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef __GNUG__ |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #include "NLEqn.h" |
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29 |
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30 #include "tree-const.h" |
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31 #include "variables.h" |
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32 #include "gripes.h" |
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33 #include "error.h" |
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34 #include "utils.h" |
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35 |
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36 // Global pointer for user defined function required by hybrd1. |
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37 static tree *fsolve_fcn; |
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38 |
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39 #ifdef WITH_DLD |
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40 tree_constant * |
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41 builtin_fsolve (tree_constant *args, int nargin, int nargout) |
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42 { |
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43 return fsolve (args, nargin, nargout); |
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44 } |
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45 #endif |
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46 |
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47 int |
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48 hybrd_info_to_fsolve_info (int info) |
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49 { |
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50 switch (info) |
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51 { |
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52 case 0: |
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53 info = -1; |
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54 break; |
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55 case 1: |
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56 break; |
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57 case 2: |
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58 info = 4; |
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59 break; |
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60 case 3: |
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61 case 4: |
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62 case 5: |
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63 info = 3; |
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64 break; |
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65 default: |
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66 panic_impossible (); |
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67 break; |
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68 } |
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69 return info; |
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70 } |
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71 |
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72 ColumnVector |
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73 fsolve_user_function (ColumnVector& x) |
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74 { |
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75 ColumnVector retval; |
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76 |
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77 int n = x.capacity (); |
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78 |
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79 // tree_constant name = tree_constant (fsolve_fcn->name ()); |
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80 tree_constant *args = new tree_constant [2]; |
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81 // args[0] = name; |
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82 |
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83 if (n > 1) |
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84 { |
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85 Matrix m (n, 1); |
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86 for (int i = 0; i < n; i++) |
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87 m (i, 0) = x.elem (i); |
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88 tree_constant vars (m); |
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89 args[1] = vars; |
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90 } |
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91 else |
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92 { |
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93 double d = x.elem (0); |
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94 tree_constant vars (d); |
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95 args[1] = vars; |
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96 } |
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97 |
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98 if (fsolve_fcn != NULL_TREE) |
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99 { |
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100 tree_constant *tmp = fsolve_fcn->eval (args, 2, 1, 0); |
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101 delete [] args; |
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102 if (tmp != NULL_TREE_CONST && tmp[0].is_defined ()) |
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103 { |
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104 retval = tmp[0].to_vector (); |
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105 delete [] tmp; |
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106 } |
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107 else |
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108 { |
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109 delete [] tmp; |
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110 gripe_user_supplied_eval ("fsolve"); |
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111 jump_to_top_level (); |
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112 } |
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113 } |
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114 |
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115 return retval; |
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116 } |
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117 |
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118 tree_constant * |
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119 fsolve (tree_constant *args, int nargin, int nargout) |
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120 { |
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121 // Assumes that we have been given the correct number of arguments. |
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122 |
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123 tree_constant *retval = NULL_TREE_CONST; |
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124 |
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125 fsolve_fcn = is_valid_function (args[1], "fsolve", 1); |
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126 if (fsolve_fcn == NULL_TREE |
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127 || takes_correct_nargs (fsolve_fcn, 2, "fsolve", 1) != 1) |
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128 return retval; |
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129 |
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130 ColumnVector x = args[2].to_vector (); |
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131 |
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132 if (nargin > 3) |
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133 message ("fsolve", "ignoring optional arguments..."); |
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134 |
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135 if (nargout > 2) |
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136 message ("fsolve", "can't compute path output yet..."); |
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137 |
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138 NLFunc foo_fcn (fsolve_user_function); |
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139 NLEqn foo (x, foo_fcn); |
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140 |
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141 int info; |
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142 ColumnVector soln = foo.solve (info); |
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143 |
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144 info = hybrd_info_to_fsolve_info (info); |
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145 |
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146 retval = new tree_constant [nargout+1]; |
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147 retval[0] = tree_constant (soln, 1); |
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148 |
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149 if (nargout > 1) |
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150 retval[1] = tree_constant ((double) info); |
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151 |
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152 if (nargout > 2) |
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153 retval[2] = tree_constant (); |
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154 |
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155 return retval; |
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156 } |
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157 |
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158 /* |
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159 ;;; Local Variables: *** |
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160 ;;; mode: C++ *** |
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161 ;;; page-delimiter: "^/\\*" *** |
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162 ;;; End: *** |
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163 */ |
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164 |
