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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, 1994 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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519
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38 #include "defun-dld.h" |
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39 |
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40 // Global pointer for user defined function required by dassl. |
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488
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41 static tree_fvc *dassl_fcn; |
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42 |
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289
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43 static ODE_options dassl_opts; |
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44 |
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45 ColumnVector |
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46 dassl_user_function (const ColumnVector& x, const ColumnVector& xdot, double t) |
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47 { |
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48 ColumnVector retval; |
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49 |
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50 int nstates = x.capacity (); |
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51 |
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52 assert (nstates == xdot.capacity ()); |
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53 |
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54 // tree_constant name (dassl_fcn->name ()); |
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55 Octave_object args (4); |
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56 // args(0) = name; |
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57 args(3) = 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.elem (i); |
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66 m2 (i, 0) = xdot.elem (i); |
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67 } |
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68 tree_constant state (m1); |
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69 tree_constant deriv (m2); |
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70 args(1) = state; |
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71 args(2) = deriv; |
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72 } |
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73 else |
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74 { |
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75 double d1 = x.elem (0); |
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76 double d2 = xdot.elem (0); |
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77 tree_constant state (d1); |
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78 tree_constant deriv (d2); |
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79 args(1) = state; |
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80 args(2) = deriv; |
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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_object tmp = dassl_fcn->eval (0, 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).to_vector (); |
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96 |
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97 if (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", Fdassl, Sdassl, 5, 1, |
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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_object 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 < 5 || nargin > 6) |
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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 = is_valid_function (args(1), "dassl", 1); |
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129 if (! dassl_fcn || takes_correct_nargs (dassl_fcn, 4, "dassl", 1) != 1) |
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130 return retval; |
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131 |
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132 ColumnVector state = args(2).to_vector (); |
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133 ColumnVector deriv = args(3).to_vector (); |
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134 ColumnVector out_times = args(4).to_vector (); |
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135 ColumnVector crit_times; |
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136 int crit_times_set = 0; |
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137 if (nargin > 5) |
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138 { |
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139 crit_times = args(5).to_vector (); |
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140 crit_times_set = 1; |
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141 } |
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142 |
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143 if (state.capacity () != deriv.capacity ()) |
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144 { |
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145 error ("dassl: x and xdot must have the same size"); |
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146 return retval; |
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147 } |
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148 |
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149 double tzero = out_times.elem (0); |
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150 |
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151 DAEFunc func (dassl_user_function); |
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152 DAE dae (state, deriv, tzero, func); |
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153 dae.copy (dassl_opts); |
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154 |
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155 Matrix output; |
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156 Matrix deriv_output; |
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157 |
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158 if (crit_times_set) |
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159 output = dae.integrate (out_times, deriv_output, crit_times); |
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160 else |
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161 output = dae.integrate (out_times, deriv_output); |
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162 |
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163 retval.resize (2); |
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164 retval(0) = output; |
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165 retval(1) = deriv_output; |
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166 return retval; |
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167 } |
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168 |
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169 typedef void (ODE_options::*d_set_opt_mf) (double); |
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170 typedef double (ODE_options::*d_get_opt_mf) (void); |
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171 |
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172 #define MAX_TOKENS 3 |
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173 |
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174 struct DAE_OPTIONS |
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175 { |
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176 const char *keyword; |
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177 const char *kw_tok[MAX_TOKENS + 1]; |
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178 int min_len[MAX_TOKENS + 1]; |
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179 int min_toks_to_match; |
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180 d_set_opt_mf d_set_fcn; |
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181 d_get_opt_mf d_get_fcn; |
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182 }; |
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183 |
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184 static DAE_OPTIONS dassl_option_table [] = |
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185 { |
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186 { "absolute tolerance", |
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187 { "absolute", "tolerance", 0, 0, }, |
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188 { 1, 0, 0, 0, }, 1, |
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189 ODE_options::set_absolute_tolerance, |
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190 ODE_options::absolute_tolerance, }, |
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191 |
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192 { "initial step size", |
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193 { "initial", "step", "size", 0, }, |
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194 { 1, 0, 0, 0, }, 1, |
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195 ODE_options::set_initial_step_size, |
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196 ODE_options::initial_step_size, }, |
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197 |
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198 { "maximum step size", |
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199 { "maximum", "step", "size", 0, }, |
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200 { 2, 0, 0, 0, }, 1, |
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201 ODE_options::set_maximum_step_size, |
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202 ODE_options::maximum_step_size, }, |
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203 |
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204 { "relative tolerance", |
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205 { "relative", "tolerance", 0, 0, }, |
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206 { 1, 0, 0, 0, }, 1, |
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207 ODE_options::set_relative_tolerance, |
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208 ODE_options::relative_tolerance, }, |
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209 |
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210 { 0, |
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211 { 0, 0, 0, 0, }, |
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212 { 0, 0, 0, 0, }, 0, |
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213 0, 0, }, |
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214 }; |
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215 |
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216 static void |
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217 print_dassl_option_list (void) |
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218 { |
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219 ostrstream output_buf; |
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220 |
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221 print_usage ("dassl_options", 1); |
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222 |
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223 output_buf << "\n" |
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224 << "Options for dassl include:\n\n" |
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225 << " keyword value\n" |
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226 << " ------- -----\n\n"; |
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227 |
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228 DAE_OPTIONS *list = dassl_option_table; |
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229 |
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230 const char *keyword; |
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231 while ((keyword = list->keyword) != 0) |
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232 { |
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233 output_buf.form (" %-40s ", keyword); |
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234 |
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235 double val = (dassl_opts.*list->d_get_fcn) (); |
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236 if (val < 0.0) |
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237 output_buf << "computed automatically"; |
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238 else |
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239 output_buf << val; |
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240 |
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241 output_buf << "\n"; |
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242 list++; |
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243 } |
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244 |
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245 output_buf << "\n" << ends; |
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246 maybe_page_output (output_buf); |
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247 } |
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248 |
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249 static void |
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250 do_dassl_option (char *keyword, double val) |
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251 { |
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252 DAE_OPTIONS *list = dassl_option_table; |
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253 |
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254 while (list->keyword != 0) |
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255 { |
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256 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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257 list->min_toks_to_match, MAX_TOKENS)) |
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258 { |
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259 (dassl_opts.*list->d_set_fcn) (val); |
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260 |
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261 return; |
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262 } |
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263 list++; |
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264 } |
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265 |
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266 warning ("dassl_options: no match for `%s'", keyword); |
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267 } |
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268 |
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269 DEFUN_DLD ("dassl_options", Fdassl_options, Sdassl_options, -1, 1, |
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270 "dassl_options (KEYWORD, VALUE)\n\ |
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271 \n\ |
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272 Set or show options for dassl. Keywords may be abbreviated\n\ |
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273 to the shortest match.") |
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272
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274 { |
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275 Octave_object retval; |
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276 |
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277 int nargin = args.length (); |
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278 |
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279 if (nargin == 1) |
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280 { |
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281 print_dassl_option_list (); |
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282 } |
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283 else if (nargin == 3) |
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284 { |
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285 if (args(1).is_string_type ()) |
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286 { |
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287 char *keyword = args(1).string_value (); |
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288 double val = args(2).double_value (); |
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289 do_dassl_option (keyword, val); |
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290 } |
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291 else |
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292 print_usage ("dassl_options"); |
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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 return retval; |
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298 } |
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299 |
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300 /* |
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301 ;;; Local Variables: *** |
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302 ;;; mode: C++ *** |
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303 ;;; page-delimiter: "^/\\*" *** |
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304 ;;; End: *** |
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305 */ |
