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1 // LSODE.h -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_LSODE_h) |
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25 #define octave_LSODE_h 1 |
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26 |
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27 #if defined (__GNUG__) |
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28 #pragma interface |
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29 #endif |
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30 |
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31 #if 0 |
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32 class ostream; |
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33 #endif |
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34 |
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35 #include <cfloat> |
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36 #include <cmath> |
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37 |
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38 #include "ODE.h" |
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39 |
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40 class |
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41 LSODE_options |
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42 { |
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43 public: |
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44 |
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45 LSODE_options (void) { init (); } |
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46 |
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47 LSODE_options (const LSODE_options& opt) { copy (opt); } |
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48 |
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49 LSODE_options& operator = (const LSODE_options& opt) |
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50 { |
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51 if (this != &opt) |
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52 copy (opt); |
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53 |
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54 return *this; |
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55 } |
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56 |
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57 ~LSODE_options (void) { } |
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58 |
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59 void init (void) |
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60 { |
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61 double sqrt_eps = ::sqrt (DBL_EPSILON); |
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62 |
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63 x_absolute_tolerance = sqrt_eps; |
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64 x_initial_step_size = -1.0; |
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65 x_maximum_step_size = -1.0; |
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66 x_minimum_step_size = 0.0; |
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67 x_relative_tolerance = sqrt_eps; |
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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 |
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79 void set_default_options (void) { init (); } |
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80 |
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81 void set_absolute_tolerance (double val) |
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82 { x_absolute_tolerance = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); } |
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83 |
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84 void set_initial_step_size (double val) |
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85 { x_initial_step_size = (val >= 0.0) ? val : -1.0; } |
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86 |
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87 void set_maximum_step_size (double val) |
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88 { x_maximum_step_size = (val >= 0.0) ? val : -1.0; } |
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89 |
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90 void set_minimum_step_size (double val) |
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91 { x_minimum_step_size = (val >= 0.0) ? val : 0.0; } |
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92 |
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93 void set_relative_tolerance (double val) |
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94 { x_relative_tolerance = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); } |
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95 |
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96 double absolute_tolerance (void) |
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97 { return x_absolute_tolerance; } |
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98 |
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99 double initial_step_size (void) |
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100 { return x_initial_step_size; } |
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101 |
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102 double maximum_step_size (void) |
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103 { return x_maximum_step_size; } |
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104 |
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105 double minimum_step_size (void) |
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106 { return x_minimum_step_size; } |
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107 |
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108 double relative_tolerance (void) |
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109 { return x_relative_tolerance; } |
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110 |
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111 private: |
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112 |
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113 double x_absolute_tolerance; |
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114 double x_initial_step_size; |
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115 double x_maximum_step_size; |
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116 double x_minimum_step_size; |
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117 double x_relative_tolerance; |
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118 }; |
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119 |
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120 class |
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121 LSODE : public ODE, public LSODE_options |
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122 { |
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123 public: |
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124 |
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125 LSODE (void); |
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126 |
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127 LSODE (int n); |
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128 |
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129 LSODE (const ColumnVector& state, double time, const ODEFunc& f); |
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130 |
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131 ~LSODE (void) { } |
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132 |
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133 void force_restart (void); |
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134 |
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135 void set_stop_time (double t); |
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136 void clear_stop_time (void); |
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137 |
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138 ColumnVector do_integrate (double t); |
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139 |
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140 Matrix do_integrate (const ColumnVector& tout); |
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141 |
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142 #if 0 |
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143 void integrate (int nsteps, double tstep, ostream& s); |
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144 #endif |
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145 |
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146 Matrix integrate (const ColumnVector& tout) |
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147 { return do_integrate (tout); } |
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148 |
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149 Matrix integrate (const ColumnVector& tout, const ColumnVector& tcrit); |
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150 |
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151 private: |
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152 |
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153 double stop_time; |
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154 int stop_time_set; |
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155 |
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156 int n; |
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157 int integration_error; |
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158 int restart; |
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159 int method_flag; |
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160 Array<int> iwork; |
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161 Array<double> rwork; |
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162 int istate; |
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163 int itol; |
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164 int itask; |
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165 int iopt; |
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166 int liw; |
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167 int lrw; |
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168 int working_too_hard; |
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169 |
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170 friend int lsode_f (int *neq, double *t, double *y, double *ydot); |
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171 |
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172 friend int lsode_j (int *neq, double *t, double *y, int *ml, int *mu, |
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173 double *pd, int *nrowpd); |
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174 }; |
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175 |
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176 #endif |
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177 |
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178 /* |
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179 ;;; Local Variables: *** |
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180 ;;; mode: C++ *** |
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181 ;;; page-delimiter: "^/\\*" *** |
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182 ;;; End: *** |
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183 */ |
