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1 // f-quad.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993, 1994 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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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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289
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28 #include <strstream.h> |
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29 |
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30 #include "Quad.h" |
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31 |
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32 #include "tree-const.h" |
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33 #include "variables.h" |
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34 #include "mappers.h" |
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35 #include "gripes.h" |
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36 #include "error.h" |
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37 #include "utils.h" |
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289
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38 #include "pager.h" |
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39 #include "f-quad.h" |
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40 |
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41 // Global pointer for user defined function required by quadrature functions. |
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488
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42 static tree_fvc *quad_fcn; |
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43 |
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44 #ifdef WITH_DLD |
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45 Octave_object |
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46 builtin_quad_2 (const Octave_object& args, int nargout) |
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47 { |
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48 return do_quad (args, nargout); |
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49 } |
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50 |
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497
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51 Octave_object |
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52 builtin_quad_options_2 (const Octave_object& args, int nargout) |
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272
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53 { |
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54 return quad_options (args, nargout); |
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272
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55 } |
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56 #endif |
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57 |
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289
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58 static Quad_options quad_opts; |
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59 |
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60 double |
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61 quad_user_function (double x) |
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62 { |
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63 double retval = 0.0; |
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64 |
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516
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65 // tree_constant name = quad_fcn->name (); |
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66 Octave_object args (2); |
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67 // args(0) = name; |
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68 args(1) = x; |
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69 |
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70 if (quad_fcn != (tree_fvc *) NULL) |
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71 { |
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72 Octave_object tmp = quad_fcn->eval (0, 1, args); |
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73 |
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74 if (error_state) |
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75 { |
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76 quad_integration_error = 1; // XXX FIXME XXX |
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77 gripe_user_supplied_eval ("quad"); |
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78 return retval; |
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79 } |
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80 |
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497
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81 if (tmp.length () && tmp(0).is_defined ()) |
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82 retval = tmp(0).to_scalar (); |
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83 else |
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84 { |
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85 quad_integration_error = 1; // XXX FIXME XXX |
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86 gripe_user_supplied_eval ("quad"); |
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87 } |
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88 } |
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89 |
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90 return retval; |
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91 } |
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92 |
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497
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93 Octave_object |
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94 do_quad (const Octave_object& args, int nargout) |
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95 { |
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96 // Assumes that we have been given the correct number of arguments. |
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97 |
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497
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98 Octave_object retval; |
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99 |
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100 int nargin = args.length (); |
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101 |
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102 quad_fcn = is_valid_function (args(1), "fsolve", 1); |
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103 if (quad_fcn == (tree_fvc *) NULL |
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104 || takes_correct_nargs (quad_fcn, 2, "fsolve", 1) != 1) |
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105 return retval; |
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106 |
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107 double a = args(2).to_scalar (); |
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108 double b = args(3).to_scalar (); |
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109 |
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110 int indefinite = 0; |
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111 IndefQuad::IntegralType indef_type = IndefQuad::doubly_infinite; |
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112 double bound = 0.0; |
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113 if ((int) xisinf (a) && (int) xisinf (b)) |
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114 { |
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115 indefinite = 1; |
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116 indef_type = IndefQuad::doubly_infinite; |
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117 } |
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118 else if ((int) xisinf (a)) |
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119 { |
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120 indefinite = 1; |
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121 bound = b; |
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122 indef_type = IndefQuad::neg_inf_to_bound; |
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123 } |
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124 else if ((int) xisinf (b)) |
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125 { |
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126 indefinite = 1; |
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127 bound = a; |
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128 indef_type = IndefQuad::bound_to_inf; |
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129 } |
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130 |
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131 int ier = 0; |
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132 int nfun = 0; |
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133 double abserr = 0.0; |
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134 double val = 0.0; |
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135 double abstol = 1e-6; |
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136 double reltol = 1e-6; |
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137 Vector tol (2); |
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138 Vector sing; |
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139 int have_sing = 0; |
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140 switch (nargin) |
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141 { |
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142 case 6: |
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143 if (indefinite) |
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144 { |
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145 error("quad: singularities not allowed on infinite intervals"); |
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146 return retval; |
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147 } |
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148 have_sing = 1; |
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149 sing = args(5).to_vector (); |
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150 case 5: |
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151 tol = args(4).to_vector (); |
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152 switch (tol.capacity ()) |
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153 { |
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154 case 2: |
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155 reltol = tol.elem (1); |
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156 case 1: |
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157 abstol = tol.elem (0); |
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158 break; |
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159 default: |
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160 error ("quad: expecting tol to contain no more than two values"); |
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161 return retval; |
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162 } |
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163 case 4: |
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164 if (indefinite) |
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165 { |
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166 IndefQuad iq (quad_user_function, bound, indef_type, abstol, reltol); |
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167 iq.copy (quad_opts); |
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168 val = iq.integrate (ier, nfun, abserr); |
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169 } |
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170 else |
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171 { |
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172 if (have_sing) |
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173 { |
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174 DefQuad dq (quad_user_function, a, b, sing, abstol, reltol); |
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175 dq.copy (quad_opts); |
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176 val = dq.integrate (ier, nfun, abserr); |
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177 } |
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178 else |
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179 { |
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180 DefQuad dq (quad_user_function, a, b, abstol, reltol); |
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181 dq.copy (quad_opts); |
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182 val = dq.integrate (ier, nfun, abserr); |
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183 } |
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184 } |
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185 break; |
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186 default: |
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187 panic_impossible (); |
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188 break; |
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189 } |
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190 |
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191 retval.resize (4); |
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192 |
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193 retval(0) = val; |
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194 retval(1) = ier; |
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195 retval(2) = nfun; |
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196 retval(3) = abserr; |
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197 |
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198 return retval; |
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199 } |
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200 |
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289
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201 typedef void (Quad_options::*d_set_opt_mf) (double); |
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202 typedef double (Quad_options::*d_get_opt_mf) (void); |
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203 |
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204 #define MAX_TOKENS 2 |
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205 |
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206 struct QUAD_OPTIONS |
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207 { |
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208 char *keyword; |
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209 char *kw_tok[MAX_TOKENS + 1]; |
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210 int min_len[MAX_TOKENS + 1]; |
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211 int min_toks_to_match; |
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212 d_set_opt_mf d_set_fcn; |
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213 d_get_opt_mf d_get_fcn; |
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214 }; |
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215 |
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216 static QUAD_OPTIONS quad_option_table [] = |
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217 { |
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218 { "absolute tolerance", |
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219 { "absolute", "tolerance", NULL, }, |
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220 { 1, 0, 0, }, 1, |
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221 Quad_options::set_absolute_tolerance, |
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222 Quad_options::absolute_tolerance, }, |
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223 |
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224 { "relative tolerance", |
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225 { "relative", "tolerance", NULL, }, |
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226 { 1, 0, 0, }, 1, |
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227 Quad_options::set_relative_tolerance, |
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228 Quad_options::relative_tolerance, }, |
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229 |
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230 { NULL, |
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231 { NULL, NULL, NULL, }, |
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232 { 0, 0, 0, }, 0, |
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233 NULL, NULL, }, |
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234 }; |
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235 |
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236 static void |
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237 print_quad_option_list (void) |
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238 { |
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239 ostrstream output_buf; |
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240 |
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241 print_usage ("quad_options", 1); |
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242 |
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243 output_buf << "\n" |
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244 << "Options for quad include:\n\n" |
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245 << " keyword value\n" |
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246 << " ------- -----\n\n"; |
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247 |
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248 QUAD_OPTIONS *list = quad_option_table; |
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249 |
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250 char *keyword; |
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251 while ((keyword = list->keyword) != (char *) NULL) |
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252 { |
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253 output_buf.form (" %-40s ", keyword); |
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254 |
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255 double val = (quad_opts.*list->d_get_fcn) (); |
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256 if (val < 0.0) |
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257 output_buf << "computed automatically"; |
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258 else |
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259 output_buf << val; |
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260 |
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261 output_buf << "\n"; |
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262 list++; |
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263 } |
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264 |
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265 output_buf << "\n" << ends; |
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266 maybe_page_output (output_buf); |
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267 } |
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268 |
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269 static void |
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270 do_quad_option (char *keyword, double val) |
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271 { |
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272 QUAD_OPTIONS *list = quad_option_table; |
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273 |
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274 while (list->keyword != (char *) NULL) |
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275 { |
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276 if (keyword_almost_match (list->kw_tok, list->min_len, keyword, |
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277 list->min_toks_to_match, MAX_TOKENS)) |
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278 { |
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279 (quad_opts.*list->d_set_fcn) (val); |
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280 |
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281 return; |
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282 } |
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283 list++; |
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284 } |
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285 |
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286 warning ("quad_options: no match for `%s'", keyword); |
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287 } |
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288 |
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289 Octave_object |
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290 quad_options (const Octave_object& args, int nargout) |
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291 { |
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292 Octave_object retval; |
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293 |
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294 int nargin = args.length (); |
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295 |
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296 if (nargin == 1) |
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297 print_quad_option_list (); |
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298 else if (nargin == 3) |
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299 { |
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300 if (args(1).is_string_type ()) |
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301 { |
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302 char *keyword = args(1).string_value (); |
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303 double val = args(2).double_value (); |
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304 do_quad_option (keyword, val); |
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305 } |
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306 else |
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307 print_usage ("quad_options"); |
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308 } |
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309 else |
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310 print_usage ("quad_options"); |
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311 |
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312 return retval; |
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313 } |
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314 |
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315 /* |
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316 ;;; Local Variables: *** |
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317 ;;; mode: C++ *** |
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318 ;;; page-delimiter: "^/\\*" *** |
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319 ;;; End: *** |
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320 */ |
