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1 // f-dassl.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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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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289
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28 #include <strstream.h> |
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29 |
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30 #include "DAE.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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38 #include "f-dassl.h" |
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39 |
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40 // Global pointer for user defined function required by dassl. |
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41 static tree *dassl_fcn; |
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42 |
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43 #ifdef WITH_DLD |
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44 tree_constant * |
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45 builtin_dassl_2 (const tree_constant *args, int nargin, int nargout) |
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46 { |
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47 return dassl (args, nargin, nargout); |
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48 } |
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49 |
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50 tree_constant * |
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51 builtin_dassl_options_2 (const tree_constant *args, int nargin, int nargout) |
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52 { |
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53 return dassl_options (args, nargin, nargout); |
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54 } |
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55 #endif |
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56 |
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289
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57 static ODE_options dassl_opts; |
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58 |
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59 ColumnVector |
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60 dassl_user_function (const ColumnVector& x, const ColumnVector& xdot, double t) |
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61 { |
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62 ColumnVector retval; |
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63 |
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64 int nstates = x.capacity (); |
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65 |
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66 assert (nstates == xdot.capacity ()); |
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67 |
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68 // tree_constant name (dassl_fcn->name ()); |
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69 tree_constant *args = new tree_constant [4]; |
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70 // args[0] = name; |
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71 args[3] = tree_constant (t); |
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72 |
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73 if (nstates > 1) |
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74 { |
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75 Matrix m1 (nstates, 1); |
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76 Matrix m2 (nstates, 1); |
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77 for (int i = 0; i < nstates; i++) |
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78 { |
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79 m1 (i, 0) = x.elem (i); |
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80 m2 (i, 0) = xdot.elem (i); |
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81 } |
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82 tree_constant state (m1); |
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83 tree_constant deriv (m2); |
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84 args[1] = state; |
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85 args[2] = deriv; |
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86 } |
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87 else |
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88 { |
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89 double d1 = x.elem (0); |
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90 double d2 = xdot.elem (0); |
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91 tree_constant state (d1); |
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92 tree_constant deriv (d2); |
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93 args[1] = state; |
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94 args[2] = deriv; |
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95 } |
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96 |
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97 if (dassl_fcn != NULL_TREE) |
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98 { |
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99 tree_constant *tmp = dassl_fcn->eval (args, 4, 1, 0); |
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100 |
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101 delete [] args; |
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102 |
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103 if (error_state) |
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104 { |
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105 gripe_user_supplied_eval ("dassl"); |
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106 return retval; |
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107 } |
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108 |
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109 if (tmp != NULL_TREE_CONST && tmp[0].is_defined ()) |
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110 { |
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111 retval = tmp[0].to_vector (); |
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112 |
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113 delete [] tmp; |
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114 |
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115 if (retval.length () == 0) |
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116 gripe_user_supplied_eval ("dassl"); |
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117 } |
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118 else |
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119 { |
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120 delete [] tmp; |
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121 gripe_user_supplied_eval ("dassl"); |
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122 } |
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123 } |
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124 |
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125 return retval; |
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126 } |
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127 |
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128 tree_constant * |
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129 dassl (const tree_constant *args, int nargin, int nargout) |
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130 { |
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131 // Assumes that we have been given the correct number of arguments. |
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132 |
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133 tree_constant *retval = NULL_TREE_CONST; |
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134 |
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135 dassl_fcn = is_valid_function (args[1], "dassl", 1); |
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136 if (dassl_fcn == NULL_TREE |
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137 || takes_correct_nargs (dassl_fcn, 4, "dassl", 1) != 1) |
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138 return retval; |
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139 |
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140 ColumnVector state = args[2].to_vector (); |
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141 ColumnVector deriv = args[3].to_vector (); |
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142 ColumnVector out_times = args[4].to_vector (); |
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143 ColumnVector crit_times; |
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144 int crit_times_set = 0; |
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145 if (nargin > 5) |
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146 { |
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147 crit_times = args[5].to_vector (); |
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148 crit_times_set = 1; |
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149 } |
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150 |
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151 if (state.capacity () != deriv.capacity ()) |
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152 { |
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153 error ("dassl: x and xdot must have the same size"); |
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154 return retval; |
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155 } |
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156 |
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157 double tzero = out_times.elem (0); |
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158 |
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159 DAEFunc func (dassl_user_function); |
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160 DAE dae (state, deriv, tzero, func); |
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161 dae.copy (dassl_opts); |
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162 |
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163 Matrix output; |
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164 Matrix deriv_output; |
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165 |
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166 if (crit_times_set) |
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167 output = dae.integrate (out_times, deriv_output, crit_times); |
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168 else |
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169 output = dae.integrate (out_times, deriv_output); |
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170 |
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171 retval = new tree_constant [3]; |
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172 retval[0] = tree_constant (output); |
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173 retval[1] = tree_constant (deriv_output); |
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174 return retval; |
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175 } |
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176 |
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177 typedef void (ODE_options::*d_set_opt_mf) (double); |
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178 typedef double (ODE_options::*d_get_opt_mf) (void); |
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179 |
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180 #define MAX_TOKENS 3 |
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181 |
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182 struct ODE_OPTIONS |
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183 { |
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184 char *keyword; |
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185 char *kw_tok[MAX_TOKENS + 1]; |
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186 int min_len[MAX_TOKENS + 1]; |
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187 int min_toks_to_match; |
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188 d_set_opt_mf d_set_fcn; |
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189 d_get_opt_mf d_get_fcn; |
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190 }; |
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191 |
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192 static ODE_OPTIONS dassl_option_table[] = |
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193 { |
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194 { "absolute tolerance", |
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195 { "absolute", "tolerance", NULL, NULL, }, |
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196 { 1, 0, 0, 0, }, 1, |
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197 ODE_options::set_absolute_tolerance, |
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198 ODE_options::absolute_tolerance, }, |
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199 |
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200 { "initial step size", |
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201 { "initial", "step", "size", NULL, }, |
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202 { 1, 0, 0, 0, }, 1, |
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203 ODE_options::set_initial_step_size, |
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204 ODE_options::initial_step_size, }, |
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205 |
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206 { "maximum step size", |
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207 { "maximum", "step", "size", NULL, }, |
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208 { 2, 0, 0, 0, }, 1, |
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209 ODE_options::set_maximum_step_size, |
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210 ODE_options::maximum_step_size, }, |
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211 |
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212 { "relative tolerance", |
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213 { "relative", "tolerance", NULL, NULL, }, |
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214 { 1, 0, 0, 0, }, 1, |
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215 ODE_options::set_relative_tolerance, |
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216 ODE_options::relative_tolerance, }, |
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217 |
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218 { NULL, |
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219 { NULL, NULL, NULL, NULL, }, |
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220 { 0, 0, 0, 0, }, 0, |
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221 NULL, NULL, }, |
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222 }; |
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223 |
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224 static void |
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225 print_dassl_option_list (void) |
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226 { |
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227 ostrstream output_buf; |
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228 |
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229 print_usage ("dassl_options", 1); |
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230 |
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231 output_buf << "\n" |
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232 << "Options for dassl include:\n\n" |
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233 << " keyword value\n" |
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234 << " ------- -----\n\n"; |
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235 |
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236 ODE_OPTIONS *list = dassl_option_table; |
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237 |
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238 char *keyword; |
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239 while ((keyword = list->keyword) != (char *) NULL) |
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240 { |
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241 output_buf.form (" %-40s ", keyword); |
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242 |
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243 double val = (dassl_opts.*list->d_get_fcn) (); |
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244 if (val < 0.0) |
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245 output_buf << "computed automatically"; |
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246 else |
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247 output_buf << val; |
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248 |
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249 output_buf << "\n"; |
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250 list++; |
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251 } |
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252 |
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253 output_buf << "\n" << ends; |
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254 maybe_page_output (output_buf); |
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255 } |
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256 |
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257 static void |
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258 do_dassl_option (char *keyword, double val) |
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259 { |
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260 ODE_OPTIONS *list = dassl_option_table; |
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261 |
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262 while (list->keyword != (char *) NULL) |
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263 { |
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264 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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265 list->min_toks_to_match, MAX_TOKENS)) |
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266 { |
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267 (dassl_opts.*list->d_set_fcn) (val); |
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268 |
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269 return; |
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270 } |
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271 list++; |
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272 } |
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273 |
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274 warning ("dassl_options: no match for `%s'", keyword); |
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275 } |
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276 |
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277 tree_constant * |
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278 dassl_options (const tree_constant *args, int nargin, int nargout) |
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279 { |
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280 tree_constant *retval = NULL_TREE_CONST; |
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281 |
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282 if (nargin == 1) |
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283 { |
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284 print_dassl_option_list (); |
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285 } |
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286 else if (nargin == 3) |
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287 { |
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288 if (args[1].is_string_type ()) |
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289 { |
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290 char *keyword = args[1].string_value (); |
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291 double val = args[2].double_value (); |
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292 do_dassl_option (keyword, val); |
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293 } |
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294 else |
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295 print_usage ("dassl_options"); |
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296 } |
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297 else |
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298 { |
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299 print_usage ("dassl_options"); |
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300 } |
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301 |
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302 return retval; |
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303 } |
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304 |
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305 /* |
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306 ;;; Local Variables: *** |
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307 ;;; mode: C++ *** |
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308 ;;; page-delimiter: "^/\\*" *** |
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309 ;;; End: *** |
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310 */ |
