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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <string> |
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28 |
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29 #include <iostream.h> |
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30 |
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31 #include "DASSL.h" |
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32 |
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33 #include "defun-dld.h" |
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34 #include "error.h" |
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35 #include "gripes.h" |
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36 #include "oct-obj.h" |
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37 #include "ov-fcn.h" |
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38 #include "pager.h" |
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39 #include "utils.h" |
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40 #include "variables.h" |
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41 |
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42 // Global pointer for user defined function required by dassl. |
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43 static octave_function *dassl_fcn; |
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44 |
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45 static DASSL_options dassl_opts; |
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46 |
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47 ColumnVector |
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48 dassl_user_function (const ColumnVector& x, const ColumnVector& xdot, double t) |
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49 { |
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50 ColumnVector retval; |
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51 |
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52 int nstates = x.capacity (); |
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53 |
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54 assert (nstates == xdot.capacity ()); |
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55 |
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56 octave_value_list args; |
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57 args(2) = t; |
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58 |
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59 if (nstates > 1) |
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60 { |
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61 Matrix m1 (nstates, 1); |
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62 Matrix m2 (nstates, 1); |
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63 for (int i = 0; i < nstates; i++) |
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64 { |
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65 m1 (i, 0) = x (i); |
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66 m2 (i, 0) = xdot (i); |
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67 } |
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68 octave_value state (m1); |
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69 octave_value deriv (m2); |
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70 args(1) = deriv; |
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71 args(0) = state; |
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72 } |
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73 else |
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74 { |
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75 double d1 = x (0); |
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76 double d2 = xdot (0); |
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77 octave_value state (d1); |
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78 octave_value deriv (d2); |
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79 args(1) = deriv; |
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80 args(0) = state; |
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81 } |
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82 |
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83 if (dassl_fcn) |
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84 { |
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85 octave_value_list tmp = dassl_fcn->do_index_op (1, args); |
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86 |
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87 if (error_state) |
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88 { |
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89 gripe_user_supplied_eval ("dassl"); |
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90 return retval; |
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91 } |
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92 |
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93 if (tmp.length () > 0 && tmp(0).is_defined ()) |
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94 { |
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95 retval = tmp(0).vector_value (); |
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96 |
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97 if (error_state || retval.length () == 0) |
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98 gripe_user_supplied_eval ("dassl"); |
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99 } |
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100 else |
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101 gripe_user_supplied_eval ("dassl"); |
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102 } |
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103 |
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104 return retval; |
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105 } |
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106 |
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107 DEFUN_DLD (dassl, args, , |
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108 "dassl (\"function_name\", x_0, xdot_0, t_out)\n\ |
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109 dassl (F, X_0, XDOT_0, T_OUT, T_CRIT)\n\ |
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110 \n\ |
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111 The first argument is the name of the function to call to\n\ |
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112 compute the vector of residuals. It must have the form\n\ |
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113 \n\ |
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114 res = f (x, xdot, t)\n\ |
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115 \n\ |
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116 where x, xdot, and res are vectors, and t is a scalar.") |
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117 { |
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118 octave_value_list retval; |
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119 |
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120 int nargin = args.length (); |
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121 |
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122 if (nargin < 4 || nargin > 5) |
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123 { |
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124 print_usage ("dassl"); |
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125 return retval; |
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126 } |
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127 |
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128 dassl_fcn = extract_function |
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129 (args(0), "dassl", "__dassl_fcn__", |
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130 "function res = __dassl_fcn__ (x, xdot, t) res = ", |
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131 "; endfunction"); |
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132 |
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133 if (! dassl_fcn) |
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134 return retval; |
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135 |
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136 ColumnVector state = args(1).vector_value (); |
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137 |
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138 if (error_state) |
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139 { |
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140 error ("dassl: expecting state vector as second argument"); |
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141 return retval; |
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142 } |
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143 |
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144 ColumnVector deriv = args(2).vector_value (); |
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145 |
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146 if (error_state) |
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147 { |
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148 error ("dassl: expecting derivative vector as third argument"); |
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149 return retval; |
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150 } |
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151 |
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152 ColumnVector out_times = args(3).vector_value (); |
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153 |
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154 if (error_state) |
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155 { |
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156 error ("dassl: expecting output time vector as fourth argument"); |
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157 return retval; |
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158 } |
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159 |
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160 ColumnVector crit_times; |
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161 int crit_times_set = 0; |
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162 if (nargin > 4) |
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163 { |
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164 crit_times = args(4).vector_value (); |
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165 |
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166 if (error_state) |
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167 { |
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168 error ("dassl: expecting critical time vector as fifth argument"); |
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169 return retval; |
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170 } |
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171 |
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172 crit_times_set = 1; |
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173 } |
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174 |
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175 if (state.capacity () != deriv.capacity ()) |
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176 { |
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177 error ("dassl: x and xdot must have the same size"); |
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178 return retval; |
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179 } |
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180 |
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181 double tzero = out_times (0); |
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182 |
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183 DAEFunc func (dassl_user_function); |
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184 DASSL dae (state, deriv, tzero, func); |
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185 dae.copy (dassl_opts); |
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186 |
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187 Matrix output; |
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188 Matrix deriv_output; |
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189 |
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190 if (crit_times_set) |
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191 output = dae.integrate (out_times, deriv_output, crit_times); |
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192 else |
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193 output = dae.integrate (out_times, deriv_output); |
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194 |
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195 if (! error_state) |
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196 { |
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197 retval.resize (2); |
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198 |
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199 retval(0) = output; |
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200 retval(1) = deriv_output; |
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201 } |
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202 |
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203 return retval; |
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204 } |
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205 |
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206 typedef void (DASSL_options::*d_set_opt_mf) (double); |
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207 typedef double (DASSL_options::*d_get_opt_mf) (void); |
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208 |
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209 #define MAX_TOKENS 3 |
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210 |
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211 struct DASSL_OPTIONS |
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212 { |
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213 const char *keyword; |
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214 const char *kw_tok[MAX_TOKENS + 1]; |
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215 int min_len[MAX_TOKENS + 1]; |
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216 int min_toks_to_match; |
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217 d_set_opt_mf d_set_fcn; |
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218 d_get_opt_mf d_get_fcn; |
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219 }; |
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220 |
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221 static DASSL_OPTIONS dassl_option_table [] = |
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222 { |
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223 { "absolute tolerance", |
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224 { "absolute", "tolerance", 0, 0, }, |
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225 { 1, 0, 0, 0, }, 1, |
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226 &DASSL_options::set_absolute_tolerance, |
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227 &DASSL_options::absolute_tolerance, }, |
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228 |
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229 { "initial step size", |
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230 { "initial", "step", "size", 0, }, |
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231 { 1, 0, 0, 0, }, 1, |
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232 &DASSL_options::set_initial_step_size, |
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233 &DASSL_options::initial_step_size, }, |
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234 |
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235 { "maximum step size", |
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236 { "maximum", "step", "size", 0, }, |
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237 { 2, 0, 0, 0, }, 1, |
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238 &DASSL_options::set_maximum_step_size, |
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239 &DASSL_options::maximum_step_size, }, |
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240 |
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241 { "relative tolerance", |
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242 { "relative", "tolerance", 0, 0, }, |
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243 { 1, 0, 0, 0, }, 1, |
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244 &DASSL_options::set_relative_tolerance, |
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245 &DASSL_options::relative_tolerance, }, |
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246 |
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247 { 0, |
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248 { 0, 0, 0, 0, }, |
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249 { 0, 0, 0, 0, }, 0, |
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250 0, 0, }, |
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251 }; |
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252 |
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253 static void |
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254 print_dassl_option_list (ostream& os) |
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255 { |
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256 print_usage ("dassl_options", 1); |
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257 |
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258 os << "\n" |
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259 << "Options for dassl include:\n\n" |
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260 << " keyword value\n" |
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261 << " ------- -----\n\n"; |
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262 |
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263 DASSL_OPTIONS *list = dassl_option_table; |
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264 |
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265 const char *keyword; |
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266 while ((keyword = list->keyword) != 0) |
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267 { |
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268 os.form (" %-40s ", keyword); |
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269 |
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270 double val = (dassl_opts.*list->d_get_fcn) (); |
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271 if (val < 0.0) |
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272 os << "computed automatically"; |
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273 else |
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274 os << val; |
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275 |
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276 os << "\n"; |
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277 list++; |
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278 } |
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279 |
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280 os << "\n"; |
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281 } |
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282 |
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283 static void |
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284 set_dassl_option (const string& keyword, double val) |
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285 { |
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286 DASSL_OPTIONS *list = dassl_option_table; |
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287 |
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288 while (list->keyword != 0) |
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289 { |
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290 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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291 list->min_toks_to_match, MAX_TOKENS)) |
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292 { |
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293 (dassl_opts.*list->d_set_fcn) (val); |
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294 |
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295 return; |
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296 } |
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297 list++; |
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298 } |
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299 |
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300 warning ("dassl_options: no match for `%s'", keyword.c_str ()); |
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301 } |
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302 |
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303 static octave_value_list |
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304 show_dassl_option (const string& keyword) |
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305 { |
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306 octave_value retval; |
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307 |
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308 DASSL_OPTIONS *list = dassl_option_table; |
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309 |
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310 while (list->keyword != 0) |
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311 { |
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312 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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313 list->min_toks_to_match, MAX_TOKENS)) |
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314 { |
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315 double val = (dassl_opts.*list->d_get_fcn) (); |
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316 if (val < 0.0) |
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317 retval = "computed automatically"; |
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318 else |
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319 retval = val; |
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320 |
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321 return retval; |
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322 } |
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323 list++; |
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324 } |
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325 |
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326 warning ("dassl_options: no match for `%s'", keyword.c_str ()); |
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327 |
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328 return retval; |
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329 } |
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330 |
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331 DEFUN_DLD (dassl_options, args, , |
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332 "dassl_options (KEYWORD, VALUE)\n\ |
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333 \n\ |
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334 Set or show options for dassl. Keywords may be abbreviated\n\ |
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335 to the shortest match.") |
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336 { |
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337 octave_value_list retval; |
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338 |
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339 int nargin = args.length (); |
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340 |
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341 if (nargin == 0) |
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342 { |
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343 print_dassl_option_list (octave_stdout); |
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344 return retval; |
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345 } |
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346 else if (nargin == 1 || nargin == 2) |
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347 { |
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348 string keyword = args(0).string_value (); |
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349 |
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350 if (! error_state) |
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351 { |
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352 if (nargin == 1) |
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353 return show_dassl_option (keyword); |
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354 else |
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355 { |
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356 double val = args(1).double_value (); |
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357 |
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358 if (! error_state) |
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359 { |
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360 set_dassl_option (keyword, val); |
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361 return retval; |
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362 } |
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363 } |
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364 } |
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365 } |
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366 |
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367 print_usage ("dassl_options"); |
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368 |
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369 return retval; |
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370 } |
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371 |
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372 /* |
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373 ;;; Local Variables: *** |
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374 ;;; mode: C++ *** |
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375 ;;; End: *** |
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376 */ |
