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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 #if !defined (octave_LSODE_h) |
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24 #define octave_LSODE_h 1 |
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25 |
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26 #if defined (__GNUG__) |
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27 #pragma interface |
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28 #endif |
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29 |
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30 #include <cfloat> |
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31 #include <cmath> |
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32 |
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33 #include "ODE.h" |
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34 |
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35 class |
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36 LSODE_options |
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37 { |
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38 public: |
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39 |
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40 LSODE_options (void) { init (); } |
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41 |
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42 LSODE_options (const LSODE_options& opt) { copy (opt); } |
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43 |
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44 LSODE_options& operator = (const LSODE_options& opt) |
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45 { |
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46 if (this != &opt) |
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47 copy (opt); |
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48 |
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49 return *this; |
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50 } |
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51 |
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52 ~LSODE_options (void) { } |
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53 |
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54 void init (void) |
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55 { |
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56 double sqrt_eps = ::sqrt (DBL_EPSILON); |
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57 x_absolute_tolerance.resize (1); |
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58 x_absolute_tolerance(0) = sqrt_eps; |
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59 x_initial_step_size = -1.0; |
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60 x_maximum_step_size = -1.0; |
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61 x_minimum_step_size = 0.0; |
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62 x_relative_tolerance = sqrt_eps; |
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63 |
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64 // This is consistent with earlier versions of Octave, and is |
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65 // much larger than the default of 500 specified in the LSODE |
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66 // sources. |
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67 x_step_limit = 100000; |
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68 } |
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69 |
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70 void copy (const LSODE_options& opt) |
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71 { |
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72 x_absolute_tolerance = opt.x_absolute_tolerance; |
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73 x_initial_step_size = opt.x_initial_step_size; |
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74 x_maximum_step_size = opt.x_maximum_step_size; |
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75 x_minimum_step_size = opt.x_minimum_step_size; |
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76 x_relative_tolerance = opt.x_relative_tolerance; |
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77 |
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78 x_step_limit = opt.x_step_limit; |
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79 } |
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80 |
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81 void set_default_options (void) { init (); } |
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82 |
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83 void set_absolute_tolerance (double val) |
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84 { |
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85 x_absolute_tolerance.resize (1); |
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86 x_absolute_tolerance(0) = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); |
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87 } |
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88 |
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89 void set_absolute_tolerance (const Array<double>& val) |
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90 { x_absolute_tolerance = val; } |
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91 |
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92 void set_initial_step_size (double val) |
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93 { x_initial_step_size = (val >= 0.0) ? val : -1.0; } |
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94 |
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95 void set_maximum_step_size (double val) |
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96 { x_maximum_step_size = (val >= 0.0) ? val : -1.0; } |
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97 |
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98 void set_minimum_step_size (double val) |
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99 { x_minimum_step_size = (val >= 0.0) ? val : 0.0; } |
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100 |
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101 void set_relative_tolerance (double val) |
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102 { x_relative_tolerance = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); } |
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103 |
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104 void set_step_limit (int val) |
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105 { x_step_limit = val; } |
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106 |
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107 Array<double> absolute_tolerance (void) const |
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108 { return x_absolute_tolerance; } |
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109 |
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110 double initial_step_size (void) const |
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111 { return x_initial_step_size; } |
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112 |
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113 double maximum_step_size (void) const |
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114 { return x_maximum_step_size; } |
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115 |
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116 double minimum_step_size (void) const |
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117 { return x_minimum_step_size; } |
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118 |
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119 double relative_tolerance (void) const |
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120 { return x_relative_tolerance; } |
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121 |
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122 int step_limit (void) const |
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123 { return x_step_limit; } |
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124 |
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125 private: |
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126 |
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127 Array<double> x_absolute_tolerance; |
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128 double x_initial_step_size; |
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129 double x_maximum_step_size; |
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130 double x_minimum_step_size; |
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131 double x_relative_tolerance; |
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132 |
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133 int x_step_limit; |
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134 }; |
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135 |
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136 class |
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137 LSODE : public ODE, public LSODE_options |
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138 { |
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139 public: |
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140 |
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141 LSODE (void); |
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142 |
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143 LSODE (int n); |
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144 |
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145 LSODE (const ColumnVector& state, double time, const ODEFunc& f); |
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146 |
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147 ~LSODE (void) { } |
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148 |
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149 void force_restart (void); |
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150 |
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151 void set_stop_time (double t); |
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152 void clear_stop_time (void); |
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153 |
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154 ColumnVector do_integrate (double t); |
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155 |
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156 Matrix do_integrate (const ColumnVector& tout); |
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157 |
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158 Matrix do_integrate (const ColumnVector& tout, const ColumnVector& tcrit); |
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159 |
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160 private: |
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161 |
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162 double stop_time; |
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163 int stop_time_set; |
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164 |
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165 int n; |
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166 int integration_error; |
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167 int restart; |
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168 Array<int> iwork; |
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169 Array<double> rwork; |
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170 int istate; |
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171 int itask; |
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172 int liw; |
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173 int lrw; |
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174 int sanity_checked; |
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175 |
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176 friend int lsode_f (int *neq, double *t, double *y, double *ydot); |
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177 |
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178 friend int lsode_j (int *neq, double *t, double *y, int *ml, int *mu, |
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179 double *pd, int *nrowpd); |
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180 }; |
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181 |
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182 #endif |
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183 |
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184 /* |
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185 ;;; Local Variables: *** |
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186 ;;; mode: C++ *** |
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187 ;;; End: *** |
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188 */ |
