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1 // f-lsode.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 "ODE.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 lsode. |
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41 static tree_fvc *lsode_fcn; |
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42 |
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289
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43 static ODE_options lsode_opts; |
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44 |
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45 ColumnVector |
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46 lsode_user_function (const ColumnVector& x, 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 // tree_constant name (lsode_fcn->name ()); |
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53 Octave_object args (3); |
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54 // args(0) = name; |
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55 args(2) = t; |
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56 |
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57 if (nstates > 1) |
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58 { |
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59 Matrix m (nstates, 1); |
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60 for (int i = 0; i < nstates; i++) |
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61 m (i, 0) = x.elem (i); |
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62 tree_constant state (m); |
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63 args(1) = state; |
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64 } |
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65 else |
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66 { |
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67 double d = x.elem (0); |
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68 tree_constant state (d); |
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69 args(1) = state; |
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70 } |
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71 |
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519
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72 if (lsode_fcn) |
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73 { |
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74 Octave_object tmp = lsode_fcn->eval (0, 1, args); |
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75 |
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76 if (error_state) |
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77 { |
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78 gripe_user_supplied_eval ("lsode"); |
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79 return retval; |
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80 } |
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81 |
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497
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82 if (tmp.length () > 0 && tmp(0).is_defined ()) |
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83 { |
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84 retval = tmp(0).to_vector (); |
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85 |
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86 if (retval.length () == 0) |
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87 gripe_user_supplied_eval ("lsode"); |
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88 } |
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89 else |
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90 gripe_user_supplied_eval ("lsode"); |
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91 } |
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92 |
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93 return retval; |
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94 } |
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95 |
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96 DEFUN_DLD ("lsode", Flsode, Slsode, 6, 1, |
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97 "lsode (F, X0, T_OUT, T_CRIT)\n\ |
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98 \n\ |
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99 The first argument is the name of the function to call to\n\ |
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100 compute the vector of right hand sides. It must have the form\n\ |
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101 \n\ |
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102 xdot = f (x, t)\n\ |
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103 \n\ |
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104 where xdot and x are vectors and t is a scalar.\n") |
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105 { |
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106 Octave_object retval; |
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107 |
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108 int nargin = args.length (); |
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109 |
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110 if (nargin < 4 || nargin > 5 || nargout > 1) |
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111 { |
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112 print_usage ("lsode"); |
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113 return retval; |
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114 } |
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115 |
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116 lsode_fcn = is_valid_function (args(1), "lsode", 1); |
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117 if (! lsode_fcn || takes_correct_nargs (lsode_fcn, 3, "lsode", 1) != 1) |
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118 return retval; |
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119 |
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120 ColumnVector state = args(2).to_vector (); |
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121 ColumnVector out_times = args(3).to_vector (); |
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122 ColumnVector crit_times; |
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123 int crit_times_set = 0; |
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124 if (nargin > 4) |
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125 { |
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126 crit_times = args(4).to_vector (); |
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127 crit_times_set = 1; |
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128 } |
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129 |
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130 double tzero = out_times.elem (0); |
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131 int nsteps = out_times.capacity (); |
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132 |
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133 ODEFunc func (lsode_user_function); |
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134 ODE ode (state, tzero, func); |
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135 ode.copy (lsode_opts); |
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136 |
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137 int nstates = state.capacity (); |
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138 Matrix output (nsteps, nstates + 1); |
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139 |
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140 if (crit_times_set) |
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141 output = ode.integrate (out_times, crit_times); |
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142 else |
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143 output = ode.integrate (out_times); |
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144 |
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145 retval.resize (1); |
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146 retval(0) = output; |
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147 return retval; |
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148 } |
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149 |
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150 typedef void (ODE_options::*d_set_opt_mf) (double); |
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151 typedef double (ODE_options::*d_get_opt_mf) (void); |
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152 |
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153 #define MAX_TOKENS 3 |
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154 |
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155 struct ODE_OPTIONS |
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156 { |
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157 const char *keyword; |
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158 const char *kw_tok[MAX_TOKENS + 1]; |
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159 int min_len[MAX_TOKENS + 1]; |
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160 int min_toks_to_match; |
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161 d_set_opt_mf d_set_fcn; |
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162 d_get_opt_mf d_get_fcn; |
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163 }; |
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164 |
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165 static ODE_OPTIONS lsode_option_table [] = |
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166 { |
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167 { "absolute tolerance", |
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168 { "absolute", "tolerance", 0, 0, }, |
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169 { 1, 0, 0, 0, }, 1, |
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170 ODE_options::set_absolute_tolerance, |
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171 ODE_options::absolute_tolerance, }, |
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172 |
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173 { "initial step size", |
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174 { "initial", "step", "size", 0, }, |
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175 { 1, 0, 0, 0, }, 1, |
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176 ODE_options::set_initial_step_size, |
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177 ODE_options::initial_step_size, }, |
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178 |
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179 { "maximum step size", |
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180 { "maximum", "step", "size", 0, }, |
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181 { 2, 0, 0, 0, }, 1, |
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182 ODE_options::set_maximum_step_size, |
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183 ODE_options::maximum_step_size, }, |
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184 |
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185 { "minimum step size", |
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186 { "minimum", "step", "size", 0, }, |
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187 { 2, 0, 0, 0, }, 1, |
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188 ODE_options::set_minimum_step_size, |
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189 ODE_options::minimum_step_size, }, |
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190 |
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191 { "relative tolerance", |
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192 { "relative", "tolerance", 0, 0, }, |
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193 { 1, 0, 0, 0, }, 1, |
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194 ODE_options::set_relative_tolerance, |
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195 ODE_options::relative_tolerance, }, |
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196 |
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197 { 0, |
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198 { 0, 0, 0, 0, }, |
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199 { 0, 0, 0, 0, }, 0, |
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200 0, 0, }, |
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201 }; |
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202 |
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203 static void |
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204 print_lsode_option_list (void) |
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205 { |
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206 ostrstream output_buf; |
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207 |
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208 print_usage ("lsode_options", 1); |
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209 |
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210 output_buf << "\n" |
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211 << "Options for lsode include:\n\n" |
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212 << " keyword value\n" |
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213 << " ------- -----\n\n"; |
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214 |
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215 ODE_OPTIONS *list = lsode_option_table; |
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216 |
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217 const char *keyword; |
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218 while ((keyword = list->keyword) != 0) |
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219 { |
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220 output_buf.form (" %-40s ", keyword); |
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221 |
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222 double val = (lsode_opts.*list->d_get_fcn) (); |
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223 if (val < 0.0) |
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224 output_buf << "computed automatically"; |
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225 else |
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226 output_buf << val; |
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227 |
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228 output_buf << "\n"; |
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229 list++; |
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230 } |
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231 |
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232 output_buf << "\n" << ends; |
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233 maybe_page_output (output_buf); |
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234 } |
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235 |
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236 static void |
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237 do_lsode_option (char *keyword, double val) |
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238 { |
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239 ODE_OPTIONS *list = lsode_option_table; |
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240 |
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241 while (list->keyword != 0) |
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242 { |
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243 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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244 list->min_toks_to_match, MAX_TOKENS)) |
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245 { |
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246 (lsode_opts.*list->d_set_fcn) (val); |
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247 |
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248 return; |
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249 } |
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250 list++; |
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251 } |
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252 |
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253 warning ("lsode_options: no match for `%s'", keyword); |
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254 } |
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255 |
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256 DEFUN_DLD ("lsode_options", Flsode_options, Slsode_options, -1, 1, |
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257 "lsode_options (KEYWORD, VALUE)\n\ |
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258 \n\ |
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259 Set or show options for lsode. Keywords may be abbreviated\n\ |
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260 to the shortest match.") |
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261 { |
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262 Octave_object retval; |
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263 |
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264 int nargin = args.length (); |
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265 |
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266 if (nargin == 1) |
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267 { |
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268 print_lsode_option_list (); |
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269 } |
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270 else if (nargin == 3) |
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271 { |
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272 if (args(1).is_string_type ()) |
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273 { |
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274 char *keyword = args(1).string_value (); |
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275 double val = args(2).double_value (); |
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276 do_lsode_option (keyword, val); |
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277 } |
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278 else |
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279 print_usage ("lsode_options"); |
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280 } |
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281 else |
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282 print_usage ("lsode_options"); |
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283 |
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284 return retval; |
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285 } |
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286 |
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287 /* |
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288 ;;; Local Variables: *** |
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289 ;;; mode: C++ *** |
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290 ;;; page-delimiter: "^/\\*" *** |
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291 ;;; End: *** |
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292 */ |
