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1 /* |
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2 |
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3 Copyright (C) 1996, 1997, 2002 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 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <string> |
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28 |
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29 #include <iomanip> |
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30 #include <iostream> |
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31 |
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32 #include "DASPK.h" |
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33 |
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34 #include "defun-dld.h" |
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35 #include "error.h" |
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36 #include "gripes.h" |
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37 #include "oct-obj.h" |
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38 #include "ov-fcn.h" |
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39 #include "pager.h" |
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40 #include "unwind-prot.h" |
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41 #include "utils.h" |
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42 #include "variables.h" |
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43 |
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44 #include "DASPK-opts.cc" |
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45 |
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46 // Global pointer for user defined function required by daspk. |
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47 static octave_function *daspk_fcn; |
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48 |
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49 // Is this a recursive call? |
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50 static int call_depth = 0; |
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51 |
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52 ColumnVector |
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53 daspk_user_function (const ColumnVector& x, const ColumnVector& xdot, |
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54 double t, int& ires) |
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55 { |
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56 ColumnVector retval; |
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57 |
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58 int nstates = x.capacity (); |
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59 |
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60 assert (nstates == xdot.capacity ()); |
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61 |
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62 octave_value_list args; |
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63 args(2) = t; |
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64 |
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65 if (nstates > 1) |
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66 { |
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67 Matrix m1 (nstates, 1); |
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68 Matrix m2 (nstates, 1); |
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69 for (int i = 0; i < nstates; i++) |
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70 { |
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71 m1 (i, 0) = x (i); |
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72 m2 (i, 0) = xdot (i); |
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73 } |
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74 octave_value state (m1); |
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75 octave_value deriv (m2); |
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76 args(1) = deriv; |
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77 args(0) = state; |
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78 } |
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79 else |
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80 { |
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81 double d1 = x (0); |
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82 double d2 = xdot (0); |
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83 octave_value state (d1); |
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84 octave_value deriv (d2); |
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85 args(1) = deriv; |
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86 args(0) = state; |
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87 } |
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88 |
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89 if (daspk_fcn) |
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90 { |
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91 octave_value_list tmp = daspk_fcn->do_multi_index_op (1, args); |
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92 |
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93 if (error_state) |
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94 { |
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95 gripe_user_supplied_eval ("daspk"); |
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96 return retval; |
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97 } |
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98 |
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99 int tlen = tmp.length (); |
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100 if (tlen > 0 && tmp(0).is_defined ()) |
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101 { |
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102 retval = ColumnVector (tmp(0).vector_value ()); |
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103 |
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104 if (tlen > 1) |
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105 ires = tmp(1).int_value (); |
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106 |
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107 if (error_state || retval.length () == 0) |
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108 gripe_user_supplied_eval ("daspk"); |
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109 } |
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110 else |
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111 gripe_user_supplied_eval ("daspk"); |
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112 } |
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113 |
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114 return retval; |
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115 } |
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116 |
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117 #define DASPK_ABORT() \ |
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118 do \ |
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119 { \ |
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120 unwind_protect::run_frame ("Fdaspk"); \ |
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121 return retval; \ |
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122 } \ |
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123 while (0) |
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124 |
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125 #define DASPK_ABORT1(msg) \ |
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126 do \ |
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127 { \ |
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128 ::error ("daspk: " msg); \ |
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129 DASPK_ABORT (); \ |
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130 } \ |
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131 while (0) |
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132 |
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133 #define DASPK_ABORT2(fmt, arg) \ |
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134 do \ |
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135 { \ |
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136 ::error ("daspk: " fmt, arg); \ |
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137 DASPK_ABORT (); \ |
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138 } \ |
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139 while (0) |
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140 |
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141 DEFUN_DLD (daspk, args, nargout, |
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142 "-*- texinfo -*-\n\ |
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143 @deftypefn {Loadable Function} {[@var{x}, @var{xdot}] =} daspk (@var{fcn}, @var{x0}, @var{xdot0}, @var{t}, @var{t_crit})\n\ |
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144 Return a matrix of states and their first derivatives with respect to\n\ |
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145 @var{t}. Each row in the result matrices correspond to one of the\n\ |
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146 elements in the vector @var{t}. The first element of @var{t}\n\ |
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147 corresponds to the initial state @var{x0} and derivative @var{xdot0}, so\n\ |
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148 that the first row of the output @var{x} is @var{x0} and the first row\n\ |
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149 of the output @var{xdot} is @var{xdot0}.\n\ |
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150 \n\ |
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151 The first argument, @var{fcn}, is a string that names the function to\n\ |
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152 call to compute the vector of residuals for the set of equations.\n\ |
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153 It must have the form\n\ |
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154 \n\ |
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155 @example\n\ |
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156 @var{res} = f (@var{x}, @var{xdot}, @var{t})\n\ |
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157 @end example\n\ |
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158 \n\ |
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159 @noindent\n\ |
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160 where @var{x}, @var{xdot}, and @var{res} are vectors, and @var{t} is a\n\ |
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161 scalar.\n\ |
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162 \n\ |
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163 The second and third arguments to @code{daspk} specify the initial\n\ |
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164 condition of the states and their derivatives, and the fourth argument\n\ |
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165 specifies a vector of output times at which the solution is desired, \n\ |
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166 including the time corresponding to the initial condition.\n\ |
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167 \n\ |
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168 The set of initial states and derivatives are not strictly required to\n\ |
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169 be consistent. In practice, however, @sc{Dassl} is not very good at\n\ |
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170 determining a consistent set for you, so it is best if you ensure that\n\ |
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171 the initial values result in the function evaluating to zero.\n\ |
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172 \n\ |
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173 The fifth argument is optional, and may be used to specify a set of\n\ |
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174 times that the DAE solver should not integrate past. It is useful for\n\ |
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175 avoiding difficulties with singularities and points where there is a\n\ |
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176 discontinuity in the derivative.\n\ |
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177 \n\ |
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178 You can use the function @code{daspk_options} to set optional\n\ |
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179 parameters for @code{daspk}.\n\ |
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180 @end deftypefn") |
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181 { |
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182 octave_value_list retval; |
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183 |
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184 unwind_protect::begin_frame ("Fdaspk"); |
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185 |
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186 unwind_protect_int (call_depth); |
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187 call_depth++; |
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188 |
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189 if (call_depth > 1) |
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190 DASPK_ABORT1 ("invalid recursive call"); |
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191 |
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192 int nargin = args.length (); |
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193 |
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194 if (nargin > 3 && nargin < 6) |
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195 { |
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196 daspk_fcn = extract_function |
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197 (args(0), "daspk", "__daspk_fcn__", |
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198 "function res = __daspk_fcn__ (x, xdot, t) res = ", |
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199 "; endfunction"); |
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200 |
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201 if (! daspk_fcn) |
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202 DASPK_ABORT (); |
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203 |
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204 ColumnVector state = ColumnVector (args(1).vector_value ()); |
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205 |
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206 if (error_state) |
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207 DASPK_ABORT1 ("expecting state vector as second argument"); |
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208 |
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209 ColumnVector deriv (args(2).vector_value ()); |
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210 |
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211 if (error_state) |
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212 DASPK_ABORT1 ("expecting derivative vector as third argument"); |
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213 |
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214 ColumnVector out_times (args(3).vector_value ()); |
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215 |
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216 if (error_state) |
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217 DASPK_ABORT1 ("expecting output time vector as fourth argument"); |
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218 |
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219 ColumnVector crit_times; |
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220 int crit_times_set = 0; |
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221 if (nargin > 4) |
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222 { |
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223 crit_times = ColumnVector (args(4).vector_value ()); |
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224 |
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225 if (error_state) |
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226 DASPK_ABORT1 ("expecting critical time vector as fifth argument"); |
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227 |
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228 crit_times_set = 1; |
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229 } |
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230 |
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231 if (state.capacity () != deriv.capacity ()) |
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232 DASPK_ABORT1 ("x and xdot must have the same size"); |
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233 |
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234 double tzero = out_times (0); |
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235 |
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236 DAEFunc func (daspk_user_function); |
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237 DASPK dae (state, deriv, tzero, func); |
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238 dae.copy (daspk_opts); |
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239 |
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240 Matrix output; |
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241 Matrix deriv_output; |
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242 |
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243 if (crit_times_set) |
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244 output = dae.integrate (out_times, deriv_output, crit_times); |
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245 else |
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246 output = dae.integrate (out_times, deriv_output); |
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247 |
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248 if (! error_state) |
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249 { |
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250 std::string msg = dae.error_message (); |
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251 |
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252 retval(3) = msg; |
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253 retval(2) = static_cast<double> (dae.integration_state ()); |
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254 |
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255 if (dae.integration_ok ()) |
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256 { |
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257 retval(1) = deriv_output; |
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258 retval(0) = output; |
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259 } |
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260 else |
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261 { |
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262 retval(1) = Matrix (); |
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263 retval(0) = Matrix (); |
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264 |
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265 if (nargout < 3) |
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266 error ("daspk: %s", msg.c_str ()); |
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267 } |
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268 } |
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269 } |
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270 else |
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271 print_usage ("daspk"); |
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272 |
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273 unwind_protect::run_frame ("Fdaspk"); |
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274 |
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275 return retval; |
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276 } |
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277 |
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278 /* |
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279 ;;; Local Variables: *** |
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280 ;;; mode: C++ *** |
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281 ;;; End: *** |
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282 */ |
