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1 // tc-lsode.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993 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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24 #ifdef __GNUG__ |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #include "ODE.h" |
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29 |
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30 #include "tree-const.h" |
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31 #include "variables.h" |
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32 #include "gripes.h" |
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33 #include "error.h" |
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34 #include "utils.h" |
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35 |
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36 // Global pointer for user defined function required by lsode. |
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37 static tree *lsode_fcn; |
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38 |
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39 |
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40 #ifdef WITH_DLD |
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41 tree_constant * |
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42 builtin_lsode_2 (tree_constant *args, int nargin, int nargout) |
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43 { |
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44 return lsode (args, nargin, nargout); |
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45 } |
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46 #endif |
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47 |
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48 ColumnVector |
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49 lsode_user_function (const ColumnVector& x, double t) |
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50 { |
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51 ColumnVector retval; |
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52 |
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53 int nstates = x.capacity (); |
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54 |
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55 // tree_constant name (lsode_fcn->name ()); |
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56 tree_constant *args = new tree_constant [3]; |
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57 // args[0] = name; |
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58 args[2] = tree_constant (t); |
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59 |
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60 if (nstates > 1) |
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61 { |
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62 Matrix m (nstates, 1); |
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63 for (int i = 0; i < nstates; i++) |
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64 m (i, 0) = x.elem (i); |
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65 tree_constant state (m); |
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66 args[1] = state; |
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67 } |
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68 else |
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69 { |
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70 double d = x.elem (0); |
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71 tree_constant state (d); |
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72 args[1] = state; |
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73 } |
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74 |
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75 if (lsode_fcn != NULL_TREE) |
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76 { |
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77 tree_constant *tmp = lsode_fcn->eval (args, 3, 1, 0); |
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78 delete [] args; |
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79 if (tmp != NULL_TREE_CONST && tmp[0].is_defined ()) |
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80 { |
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81 retval = tmp[0].to_vector (); |
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82 delete [] tmp; |
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83 } |
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84 else |
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85 { |
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86 delete [] tmp; |
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87 gripe_user_supplied_eval ("lsode"); |
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88 jump_to_top_level (); |
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89 } |
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90 } |
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91 |
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92 return retval; |
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93 } |
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94 |
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95 tree_constant * |
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96 lsode (tree_constant *args, int nargin, int nargout) |
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97 { |
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98 // Assumes that we have been given the correct number of arguments. |
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99 |
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100 tree_constant *retval = NULL_TREE_CONST; |
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101 |
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102 lsode_fcn = is_valid_function (args[1], "lsode", 1); |
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103 if (lsode_fcn == NULL_TREE |
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104 || takes_correct_nargs (lsode_fcn, 3, "lsode", 1) != 1) |
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105 return retval; |
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106 |
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107 ColumnVector state = args[2].to_vector (); |
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108 ColumnVector out_times = args[3].to_vector (); |
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109 ColumnVector crit_times; |
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110 int crit_times_set = 0; |
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111 if (nargin > 4) |
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112 { |
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113 crit_times = args[4].to_vector (); |
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114 crit_times_set = 1; |
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115 } |
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116 |
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117 double tzero = out_times.elem (0); |
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118 int nsteps = out_times.capacity (); |
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119 |
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120 ODEFunc func (lsode_user_function); |
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121 ODE ode (state, tzero, func); |
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122 |
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123 int nstates = state.capacity (); |
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124 Matrix output (nsteps, nstates + 1); |
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125 |
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126 if (crit_times_set) |
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127 output = ode.integrate (out_times, crit_times); |
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128 else |
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129 output = ode.integrate (out_times); |
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130 |
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131 retval = new tree_constant [2]; |
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132 retval[0] = tree_constant (output); |
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133 return retval; |
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134 } |
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135 |
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136 /* |
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137 ;;; Local Variables: *** |
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138 ;;; mode: C++ *** |
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139 ;;; page-delimiter: "^/\\*" *** |
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140 ;;; End: *** |
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141 */ |
