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1 // f-fsolve.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993, 1994, 1995 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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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <strstream.h> |
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29 |
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30 #include "NLEqn.h" |
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31 |
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32 #include "tree-const.h" |
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33 #include "variables.h" |
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34 #include "gripes.h" |
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35 #include "error.h" |
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36 #include "utils.h" |
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289
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37 #include "pager.h" |
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544
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38 #include "help.h" |
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519
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39 #include "defun-dld.h" |
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40 |
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41 // Global pointer for user defined function required by hybrd1. |
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42 static tree_fvc *fsolve_fcn; |
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43 |
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289
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44 static NLEqn_options fsolve_opts; |
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45 |
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46 int |
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47 hybrd_info_to_fsolve_info (int info) |
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48 { |
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49 switch (info) |
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50 { |
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252
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51 case -1: |
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52 info = -2; |
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53 break; |
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54 |
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55 case 0: |
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56 info = -1; |
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57 break; |
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58 |
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59 case 1: |
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60 break; |
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61 |
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62 case 2: |
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63 info = 4; |
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64 break; |
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65 |
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66 case 3: |
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67 case 4: |
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68 case 5: |
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69 info = 3; |
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70 break; |
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71 |
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72 default: |
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73 panic_impossible (); |
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74 break; |
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75 } |
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76 |
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77 return info; |
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78 } |
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79 |
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80 ColumnVector |
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81 fsolve_user_function (const ColumnVector& x) |
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82 { |
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83 ColumnVector retval; |
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84 |
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85 int n = x.capacity (); |
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86 |
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87 Octave_object args; |
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88 args.resize (1); |
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89 |
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90 if (n > 1) |
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91 { |
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92 Matrix m (n, 1); |
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93 for (int i = 0; i < n; i++) |
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94 m (i, 0) = x.elem (i); |
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95 tree_constant vars (m); |
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96 args(0) = vars; |
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97 } |
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98 else |
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99 { |
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100 double d = x.elem (0); |
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101 tree_constant vars (d); |
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102 args(0) = vars; |
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103 } |
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104 |
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105 if (fsolve_fcn) |
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106 { |
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107 Octave_object tmp = fsolve_fcn->eval (0, 1, args); |
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108 if (tmp.length () > 0 && tmp(0).is_defined ()) |
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109 { |
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110 retval = tmp(0).vector_value (); |
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111 |
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112 if (error_state || retval.length () <= 0) |
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113 gripe_user_supplied_eval ("fsolve"); |
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114 } |
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115 else |
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116 gripe_user_supplied_eval ("fsolve"); |
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117 } |
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118 |
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119 return retval; |
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120 } |
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121 |
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122 DEFUN_DLD_BUILTIN ("fsolve", Ffsolve, Sfsolve, 2, 1, |
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123 "Solve nonlinear equations using Minpack. Usage:\n\ |
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124 \n\ |
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125 [X, INFO] = fsolve (F, X0)\n\ |
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126 \n\ |
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127 Where the first argument is the name of the function to call to\n\ |
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128 compute the vector of function values. It must have the form\n\ |
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129 \n\ |
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130 y = f (x) |
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131 \n\ |
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132 where y and x are vectors.") |
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133 { |
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134 Octave_object retval; |
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135 |
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136 int nargin = args.length (); |
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137 |
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138 if (nargin != 2 || nargout > 3) |
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139 { |
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140 print_usage ("fsolve"); |
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141 return retval; |
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142 } |
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143 |
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144 fsolve_fcn = is_valid_function (args(0), "fsolve", 1); |
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145 if (! fsolve_fcn || takes_correct_nargs (fsolve_fcn, 1, "fsolve", 1) != 1) |
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146 return retval; |
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147 |
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148 ColumnVector x = args(1).vector_value (); |
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149 |
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150 if (error_state) |
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151 { |
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152 error ("fsolve: expecting vector as second argument"); |
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153 return retval; |
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154 } |
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155 |
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156 if (nargin > 2) |
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157 warning ("fsolve: ignoring extra arguments"); |
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158 |
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159 if (nargout > 2) |
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160 warning ("fsolve: can't compute path output yet"); |
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161 |
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162 NLFunc foo_fcn (fsolve_user_function); |
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163 NLEqn foo (x, foo_fcn); |
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164 foo.copy (fsolve_opts); |
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165 |
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166 int info; |
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167 ColumnVector soln = foo.solve (info); |
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168 |
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169 info = hybrd_info_to_fsolve_info (info); |
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170 |
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171 retval.resize (nargout ? nargout : 1); |
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172 retval(0) = soln, 1; |
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173 |
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174 if (nargout > 1) |
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175 retval(1) = (double) info; |
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176 |
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177 return retval; |
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178 } |
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179 |
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180 typedef void (NLEqn_options::*d_set_opt_mf) (double); |
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181 typedef double (NLEqn_options::*d_get_opt_mf) (void); |
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182 |
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183 #define MAX_TOKENS 1 |
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184 |
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185 struct NLEQN_OPTIONS |
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186 { |
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187 const char *keyword; |
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188 const char *kw_tok[MAX_TOKENS + 1]; |
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189 int min_len[MAX_TOKENS + 1]; |
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190 int min_toks_to_match; |
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191 d_set_opt_mf d_set_fcn; |
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192 d_get_opt_mf d_get_fcn; |
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193 }; |
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194 |
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195 static NLEQN_OPTIONS fsolve_option_table [] = |
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196 { |
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197 { "tolerance", |
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198 { "tolerance", 0, }, |
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199 { 1, 0, }, 1, |
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200 NLEqn_options::set_tolerance, |
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201 NLEqn_options::tolerance, }, |
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202 |
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203 { 0, |
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204 { 0, 0, }, |
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205 { 0, 0, }, 0, |
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206 0, 0, }, |
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207 }; |
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208 |
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209 static void |
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210 print_fsolve_option_list (void) |
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211 { |
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212 ostrstream output_buf; |
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213 |
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214 print_usage ("fsolve_options", 1); |
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215 |
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216 output_buf << "\n" |
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217 << "Options for fsolve include:\n\n" |
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218 << " keyword value\n" |
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219 << " ------- -----\n\n"; |
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220 |
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221 NLEQN_OPTIONS *list = fsolve_option_table; |
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222 |
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223 const char *keyword; |
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224 while ((keyword = list->keyword) != 0) |
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225 { |
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226 output_buf.form (" %-40s ", keyword); |
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227 |
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228 double val = (fsolve_opts.*list->d_get_fcn) (); |
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229 if (val < 0.0) |
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230 output_buf << "computed automatically"; |
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231 else |
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232 output_buf << val; |
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233 |
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234 output_buf << "\n"; |
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235 list++; |
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236 } |
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237 |
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238 output_buf << "\n" << ends; |
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239 maybe_page_output (output_buf); |
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240 } |
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241 |
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242 static void |
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243 do_fsolve_option (char *keyword, double val) |
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244 { |
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245 NLEQN_OPTIONS *list = fsolve_option_table; |
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246 |
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247 while (list->keyword != 0) |
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248 { |
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249 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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250 list->min_toks_to_match, MAX_TOKENS)) |
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251 { |
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252 (fsolve_opts.*list->d_set_fcn) (val); |
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253 |
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254 return; |
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255 } |
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256 list++; |
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257 } |
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258 |
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259 warning ("fsolve_options: no match for `%s'", keyword); |
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260 } |
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261 |
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262 DEFUN_DLD_BUILTIN ("fsolve_options", Ffsolve_options, Sfsolve_options, -1, 1, |
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263 "fsolve_options (KEYWORD, VALUE)\n\ |
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264 \n\ |
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265 Set or show options for fsolve. Keywords may be abbreviated\n\ |
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266 to the shortest match.") |
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272
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267 { |
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268 Octave_object retval; |
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269 |
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270 int nargin = args.length (); |
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271 |
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272 if (nargin == 0) |
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273 { |
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274 print_fsolve_option_list (); |
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275 return retval; |
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276 } |
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277 else if (nargin == 2) |
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278 { |
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279 char *keyword = args(0).string_value (); |
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280 |
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281 if (! error_state) |
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282 { |
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283 double val = args(1).double_value (); |
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284 |
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285 if (! error_state) |
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286 { |
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287 do_fsolve_option (keyword, val); |
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288 return retval; |
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289 } |
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289
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290 } |
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291 } |
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292 |
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293 print_usage ("fsolve_options"); |
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294 |
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295 return retval; |
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296 } |
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297 |
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298 /* |
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299 ;;; Local Variables: *** |
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300 ;;; mode: C++ *** |
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301 ;;; page-delimiter: "^/\\*" *** |
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302 ;;; End: *** |
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303 */ |
