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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 #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 <iostream> |
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30 |
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31 #include "DASSL.h" |
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32 |
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33 #include "defun-dld.h" |
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34 #include "error.h" |
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35 #include "gripes.h" |
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36 #include "oct-obj.h" |
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37 #include "ov-fcn.h" |
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38 #include "pager.h" |
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39 #include "unwind-prot.h" |
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40 #include "utils.h" |
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41 #include "variables.h" |
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42 |
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43 // Global pointer for user defined function required by dassl. |
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44 static octave_function *dassl_fcn; |
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45 |
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46 static DASSL_options dassl_opts; |
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47 |
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48 // Is this a recursive call? |
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49 static int call_depth = 0; |
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50 |
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51 ColumnVector |
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52 dassl_user_function (const ColumnVector& x, const ColumnVector& xdot, double t) |
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53 { |
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54 ColumnVector retval; |
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55 |
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56 int nstates = x.capacity (); |
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57 |
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58 assert (nstates == xdot.capacity ()); |
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59 |
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60 octave_value_list args; |
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61 args(2) = t; |
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62 |
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63 if (nstates > 1) |
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64 { |
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65 Matrix m1 (nstates, 1); |
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66 Matrix m2 (nstates, 1); |
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67 for (int i = 0; i < nstates; i++) |
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68 { |
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69 m1 (i, 0) = x (i); |
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70 m2 (i, 0) = xdot (i); |
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71 } |
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72 octave_value state (m1); |
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73 octave_value deriv (m2); |
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74 args(1) = deriv; |
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75 args(0) = state; |
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76 } |
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77 else |
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78 { |
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79 double d1 = x (0); |
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80 double d2 = xdot (0); |
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81 octave_value state (d1); |
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82 octave_value deriv (d2); |
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83 args(1) = deriv; |
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84 args(0) = state; |
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85 } |
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86 |
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87 if (dassl_fcn) |
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88 { |
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89 octave_value_list tmp = dassl_fcn->do_index_op (1, args); |
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90 |
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91 if (error_state) |
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92 { |
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93 gripe_user_supplied_eval ("dassl"); |
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94 return retval; |
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95 } |
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96 |
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97 if (tmp.length () > 0 && tmp(0).is_defined ()) |
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98 { |
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99 retval = ColumnVector (tmp(0).vector_value ()); |
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100 |
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101 if (error_state || retval.length () == 0) |
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102 gripe_user_supplied_eval ("dassl"); |
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103 } |
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104 else |
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105 gripe_user_supplied_eval ("dassl"); |
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106 } |
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107 |
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108 return retval; |
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109 } |
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110 |
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111 #define DASSL_ABORT() \ |
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112 do \ |
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113 { \ |
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114 unwind_protect::run_frame ("Fdassl"); \ |
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115 return retval; \ |
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116 } \ |
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117 while (0) |
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118 |
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119 #define DASSL_ABORT1(msg) \ |
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120 do \ |
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121 { \ |
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122 ::error ("dassl: " ## msg); \ |
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123 DASSL_ABORT (); \ |
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124 } \ |
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125 while (0) |
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126 |
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127 #define DASSL_ABORT2(fmt, arg) \ |
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128 do \ |
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129 { \ |
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130 ::error ("dassl: " ## fmt, arg); \ |
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131 DASSL_ABORT (); \ |
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132 } \ |
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133 while (0) |
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134 |
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135 DEFUN_DLD (dassl, args, , |
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136 "-*- texinfo -*-\n\ |
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137 @deftypefn {Loadable Function} {[@var{x}, @var{xdot}] =} dassl (@var{fcn}, @var{x0}, @var{xdot0}, @var{t}, @var{t_crit})\n\ |
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138 Return a matrix of states and their first derivatives with respect to\n\ |
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139 @var{t}. Each row in the result matrices correspond to one of the\n\ |
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140 elements in the vector @var{t}. The first element of @var{t}\n\ |
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141 corresponds to the initial state @var{x0} and derivative @var{xdot0}, so\n\ |
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142 that the first row of the output @var{x} is @var{x0} and the first row\n\ |
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143 of the output @var{xdot} is @var{xdot0}.\n\ |
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144 \n\ |
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145 The first argument, @var{fcn}, is a string that names the function to\n\ |
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146 call to compute the vector of residuals for the set of equations.\n\ |
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147 It must have the form\n\ |
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148 \n\ |
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149 @example\n\ |
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150 @var{res} = f (@var{x}, @var{xdot}, @var{t})\n\ |
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151 @end example\n\ |
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152 \n\ |
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153 @noindent\n\ |
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154 where @var{x}, @var{xdot}, and @var{res} are vectors, and @var{t} is a\n\ |
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155 scalar.\n\ |
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156 \n\ |
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157 The second and third arguments to @code{dassl} specify the initial\n\ |
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158 condition of the states and their derivatives, and the fourth argument\n\ |
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159 specifies a vector of output times at which the solution is desired, \n\ |
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160 including the time corresponding to the initial condition.\n\ |
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161 \n\ |
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162 The set of initial states and derivatives are not strictly required to\n\ |
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163 be consistent. In practice, however, @sc{Dassl} is not very good at\n\ |
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164 determining a consistent set for you, so it is best if you ensure that\n\ |
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165 the initial values result in the function evaluating to zero.\n\ |
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166 \n\ |
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167 The fifth argument is optional, and may be used to specify a set of\n\ |
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168 times that the DAE solver should not integrate past. It is useful for\n\ |
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169 avoiding difficulties with singularities and points where there is a\n\ |
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170 discontinuity in the derivative.\n\ |
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171 @end deftypefn") |
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172 { |
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173 octave_value_list retval; |
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174 |
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175 unwind_protect::begin_frame ("Fdassl"); |
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176 |
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177 unwind_protect_int (call_depth); |
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178 call_depth++; |
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179 |
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180 if (call_depth > 1) |
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181 DASSL_ABORT1 ("invalid recursive call"); |
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182 |
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183 int nargin = args.length (); |
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184 |
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185 if (nargin > 3 && nargin < 6) |
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186 { |
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187 dassl_fcn = extract_function |
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188 (args(0), "dassl", "__dassl_fcn__", |
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189 "function res = __dassl_fcn__ (x, xdot, t) res = ", |
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190 "; endfunction"); |
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191 |
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192 if (! dassl_fcn) |
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193 DASSL_ABORT (); |
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194 |
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195 ColumnVector state = ColumnVector (args(1).vector_value ()); |
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196 |
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197 if (error_state) |
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198 DASSL_ABORT1 ("expecting state vector as second argument"); |
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199 |
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200 ColumnVector deriv (args(2).vector_value ()); |
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201 |
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202 if (error_state) |
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203 DASSL_ABORT1 ("expecting derivative vector as third argument"); |
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204 |
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205 ColumnVector out_times (args(3).vector_value ()); |
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206 |
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207 if (error_state) |
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208 DASSL_ABORT1 ("expecting output time vector as fourth argument"); |
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209 |
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210 ColumnVector crit_times; |
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211 int crit_times_set = 0; |
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212 if (nargin > 4) |
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213 { |
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214 crit_times = ColumnVector (args(4).vector_value ()); |
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215 |
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216 if (error_state) |
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217 DASSL_ABORT1 ("expecting critical time vector as fifth argument"); |
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218 |
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219 crit_times_set = 1; |
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220 } |
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221 |
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222 if (state.capacity () != deriv.capacity ()) |
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223 DASSL_ABORT1 ("x and xdot must have the same size"); |
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224 |
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225 double tzero = out_times (0); |
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226 |
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227 DAEFunc func (dassl_user_function); |
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228 DASSL dae (state, deriv, tzero, func); |
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229 dae.copy (dassl_opts); |
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230 |
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231 Matrix output; |
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232 Matrix deriv_output; |
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233 |
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234 if (crit_times_set) |
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235 output = dae.integrate (out_times, deriv_output, crit_times); |
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236 else |
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237 output = dae.integrate (out_times, deriv_output); |
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238 |
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239 if (! error_state) |
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240 { |
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241 retval.resize (2); |
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242 |
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243 retval(0) = output; |
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244 retval(1) = deriv_output; |
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245 } |
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246 } |
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247 else |
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248 print_usage ("dassl"); |
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249 |
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250 unwind_protect::run_frame ("Fdassl"); |
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251 |
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252 return retval; |
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253 } |
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254 |
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255 typedef void (DASSL_options::*d_set_opt_mf) (double); |
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256 typedef double (DASSL_options::*d_get_opt_mf) (void); |
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257 |
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258 #define MAX_TOKENS 3 |
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259 |
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260 struct DASSL_OPTIONS |
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261 { |
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262 const char *keyword; |
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263 const char *kw_tok[MAX_TOKENS + 1]; |
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264 int min_len[MAX_TOKENS + 1]; |
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265 int min_toks_to_match; |
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266 d_set_opt_mf d_set_fcn; |
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267 d_get_opt_mf d_get_fcn; |
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268 }; |
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269 |
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270 static DASSL_OPTIONS dassl_option_table [] = |
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271 { |
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272 { "absolute tolerance", |
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273 { "absolute", "tolerance", 0, 0, }, |
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274 { 1, 0, 0, 0, }, 1, |
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275 &DASSL_options::set_absolute_tolerance, |
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276 &DASSL_options::absolute_tolerance, }, |
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277 |
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278 { "initial step size", |
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279 { "initial", "step", "size", 0, }, |
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280 { 1, 0, 0, 0, }, 1, |
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281 &DASSL_options::set_initial_step_size, |
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282 &DASSL_options::initial_step_size, }, |
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283 |
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284 { "maximum step size", |
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285 { "maximum", "step", "size", 0, }, |
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286 { 2, 0, 0, 0, }, 1, |
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287 &DASSL_options::set_maximum_step_size, |
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288 &DASSL_options::maximum_step_size, }, |
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289 |
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290 { "relative tolerance", |
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291 { "relative", "tolerance", 0, 0, }, |
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292 { 1, 0, 0, 0, }, 1, |
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293 &DASSL_options::set_relative_tolerance, |
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294 &DASSL_options::relative_tolerance, }, |
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295 |
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296 { 0, |
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297 { 0, 0, 0, 0, }, |
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298 { 0, 0, 0, 0, }, 0, |
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299 0, 0, }, |
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300 }; |
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301 |
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302 static void |
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303 print_dassl_option_list (std::ostream& os) |
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304 { |
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305 print_usage ("dassl_options", 1); |
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306 |
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307 os << "\n" |
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308 << "Options for dassl include:\n\n" |
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309 << " keyword value\n" |
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310 << " ------- -----\n\n"; |
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311 |
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312 DASSL_OPTIONS *list = dassl_option_table; |
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313 |
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314 const char *keyword; |
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315 while ((keyword = list->keyword) != 0) |
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316 { |
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317 os.form (" %-40s ", keyword); |
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318 |
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319 double val = (dassl_opts.*list->d_get_fcn) (); |
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320 if (val < 0.0) |
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321 os << "computed automatically"; |
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322 else |
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323 os << val; |
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324 |
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325 os << "\n"; |
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326 list++; |
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327 } |
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328 |
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329 os << "\n"; |
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330 } |
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331 |
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332 static void |
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333 set_dassl_option (const std::string& keyword, double val) |
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334 { |
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335 DASSL_OPTIONS *list = dassl_option_table; |
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336 |
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337 while (list->keyword != 0) |
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338 { |
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339 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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340 list->min_toks_to_match, MAX_TOKENS)) |
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341 { |
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342 (dassl_opts.*list->d_set_fcn) (val); |
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343 |
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344 return; |
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345 } |
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346 list++; |
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347 } |
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348 |
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349 warning ("dassl_options: no match for `%s'", keyword.c_str ()); |
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350 } |
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351 |
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352 static octave_value_list |
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353 show_dassl_option (const std::string& keyword) |
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354 { |
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355 octave_value retval; |
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356 |
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357 DASSL_OPTIONS *list = dassl_option_table; |
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358 |
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359 while (list->keyword != 0) |
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360 { |
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361 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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362 list->min_toks_to_match, MAX_TOKENS)) |
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363 { |
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364 double val = (dassl_opts.*list->d_get_fcn) (); |
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365 if (val < 0.0) |
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366 retval = "computed automatically"; |
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367 else |
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368 retval = val; |
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369 |
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370 return retval; |
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371 } |
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372 list++; |
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373 } |
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374 |
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375 warning ("dassl_options: no match for `%s'", keyword.c_str ()); |
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376 |
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377 return retval; |
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378 } |
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379 |
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380 DEFUN_DLD (dassl_options, args, , |
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381 "-*- texinfo -*-\n\ |
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382 @deftypefn {Loadable Function} {} dassl_options (@var{opt}, @var{val})\n\ |
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383 When called with two arguments, this function allows you set options\n\ |
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384 parameters for the function @code{lsode}. Given one argument,\n\ |
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385 @code{dassl_options} returns the value of the corresponding option. If\n\ |
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386 no arguments are supplied, the names of all the available options and\n\ |
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387 their current values are displayed.\n\ |
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388 @end deftypefn") |
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389 { |
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390 octave_value_list retval; |
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391 |
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392 int nargin = args.length (); |
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393 |
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394 if (nargin == 0) |
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395 { |
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396 print_dassl_option_list (octave_stdout); |
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397 return retval; |
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398 } |
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399 else if (nargin == 1 || nargin == 2) |
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400 { |
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401 std::string keyword = args(0).string_value (); |
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402 |
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403 if (! error_state) |
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404 { |
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405 if (nargin == 1) |
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406 return show_dassl_option (keyword); |
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407 else |
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408 { |
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409 double val = args(1).double_value (); |
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410 |
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411 if (! error_state) |
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412 { |
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413 set_dassl_option (keyword, val); |
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414 return retval; |
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415 } |
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416 } |
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417 } |
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418 } |
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419 |
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420 print_usage ("dassl_options"); |
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421 |
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422 return retval; |
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423 } |
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424 |
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425 /* |
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426 ;;; Local Variables: *** |
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427 ;;; mode: C++ *** |
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428 ;;; End: *** |
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429 */ |
