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1 // Quad.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 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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238
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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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28 #include "Quad.h" |
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29 #include "f77-uscore.h" |
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30 #include "sun-utils.h" |
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31 |
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32 static integrand_fcn user_fcn; |
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33 |
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34 extern "C" |
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35 { |
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36 int F77_FCN (dqagp) (const double (*)(double*), const double*, |
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37 const double*, const int*, const double*, |
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38 const double*, const double*, double*, double*, |
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39 int*, int*, const int*, const int*, int*, int*, |
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40 double*); |
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41 |
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42 int F77_FCN (dqagi) (const double (*)(double*), const double*, |
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43 const int*, const double*, const double*, |
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44 double*, double*, int*, int*, const int*, |
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45 const int*, int*, int*, double*); |
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46 } |
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47 |
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48 Quad::Quad (integrand_fcn fcn) |
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49 { |
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50 absolute_tolerance = 1.0e-6; |
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51 relative_tolerance = 1.0e-6; |
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52 f = fcn; |
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53 } |
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54 |
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55 Quad::Quad (integrand_fcn fcn, double abs, double rel) |
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56 { |
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57 absolute_tolerance = abs; |
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58 relative_tolerance = rel; |
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59 f = fcn; |
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60 } |
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61 |
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62 double |
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63 Quad::integrate (void) |
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64 { |
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65 int ier, neval; |
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66 double abserr; |
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67 return integrate (ier, neval, abserr); |
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68 } |
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69 |
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70 double |
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71 Quad::integrate (int& ier) |
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72 { |
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73 int neval; |
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74 double abserr; |
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75 return integrate (ier, neval, abserr); |
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76 } |
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77 |
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78 double |
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79 Quad::integrate (int& ier, int& neval) |
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80 { |
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81 double abserr; |
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82 return integrate (ier, neval, abserr); |
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83 } |
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84 |
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85 static double |
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86 user_function (double *x) |
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87 { |
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88 #if defined (sun) && defined (__GNUC__) |
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89 double xx = access_double (x); |
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90 #else |
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91 double xx = *x; |
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92 #endif |
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93 |
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94 return (*user_fcn) (xx); |
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95 } |
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96 |
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97 DefQuad::DefQuad (integrand_fcn fcn) : Quad (fcn) |
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98 { |
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99 lower_limit = 0.0; |
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100 upper_limit = 1.0; |
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101 } |
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102 |
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103 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul) |
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104 : Quad (fcn) |
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105 { |
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106 lower_limit = ll; |
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107 upper_limit = ul; |
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108 } |
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109 |
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110 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul, |
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111 double abs, double rel) : Quad (fcn, abs, rel) |
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112 { |
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113 lower_limit = ll; |
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114 upper_limit = ul; |
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115 } |
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116 |
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117 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul, |
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118 const Vector& sing) : Quad (fcn) |
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119 { |
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120 lower_limit = ll; |
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121 upper_limit = ul; |
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122 singularities = sing; |
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123 } |
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124 |
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125 DefQuad::DefQuad (integrand_fcn fcn, const Vector& sing, |
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126 double abs, double rel) : Quad (fcn, abs, rel) |
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127 { |
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128 lower_limit = 0.0; |
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129 upper_limit = 1.0; |
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130 singularities = sing; |
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131 } |
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132 |
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133 DefQuad::DefQuad (integrand_fcn fcn, const Vector& sing) |
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134 : Quad (fcn) |
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135 { |
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136 lower_limit = 0.0; |
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137 upper_limit = 1.0; |
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138 singularities = sing; |
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139 } |
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140 |
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141 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul, |
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142 const Vector& sing, double abs, double rel) |
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143 : Quad (fcn, abs, rel) |
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144 { |
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145 lower_limit = ll; |
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146 upper_limit = ul; |
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147 singularities = sing; |
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148 } |
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149 |
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150 double |
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151 DefQuad::integrate (int& ier, int& neval, double& abserr) |
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152 { |
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153 int npts = singularities.capacity () + 2; |
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154 double *points = singularities.fortran_vec (); |
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155 double result = 0.0; |
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156 int leniw = 183*npts - 122; |
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157 int lenw = 2*leniw - npts; |
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158 int *iwork = new int [leniw]; |
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159 double *work = new double [lenw]; |
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160 user_fcn = f; |
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161 int last; |
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162 |
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163 F77_FCN (dqagp) (user_function, &lower_limit, &upper_limit, &npts, |
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164 points, &absolute_tolerance, &relative_tolerance, |
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165 &result, &abserr, &neval, &ier, &leniw, &lenw, |
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166 &last, iwork, work); |
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167 |
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168 delete [] iwork; |
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169 delete [] work; |
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170 |
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171 return result; |
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172 } |
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173 |
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174 IndefQuad::IndefQuad (integrand_fcn fcn) : Quad (fcn) |
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175 { |
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176 bound = 0.0; |
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177 type = bound_to_inf; |
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178 } |
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179 |
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180 IndefQuad::IndefQuad (integrand_fcn fcn, double b, IntegralType t) |
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181 : Quad (fcn) |
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182 { |
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183 bound = b; |
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184 type = t; |
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185 } |
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186 |
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187 IndefQuad::IndefQuad (integrand_fcn fcn, double b, IntegralType t, |
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188 double abs, double rel) : Quad (fcn, abs, rel) |
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189 { |
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190 bound = b; |
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191 type = t; |
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192 } |
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193 |
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194 IndefQuad::IndefQuad (integrand_fcn fcn, double abs, double rel) |
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195 : Quad (fcn, abs, rel) |
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196 { |
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197 bound = 0.0; |
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198 type = bound_to_inf; |
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199 } |
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200 |
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201 double |
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202 IndefQuad::integrate (int& ier, int& neval, double& abserr) |
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203 { |
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204 double result = 0.0; |
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205 int leniw = 128; |
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206 int lenw = 8*leniw; |
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207 int *iwork = new int [leniw]; |
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208 double *work = new double [lenw]; |
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209 user_fcn = f; |
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210 int last; |
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211 |
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212 int inf; |
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213 switch (type) |
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214 { |
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215 case bound_to_inf: |
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216 inf = 1; |
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217 break; |
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218 case neg_inf_to_bound: |
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219 inf = -1; |
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220 break; |
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221 case doubly_infinite: |
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222 inf = 2; |
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223 break; |
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224 default: |
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225 assert (0); |
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226 break; |
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227 } |
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228 |
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229 F77_FCN (dqagi) (user_function, &bound, &inf, &absolute_tolerance, |
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230 &relative_tolerance, &result, &abserr, &neval, |
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231 &ier, &leniw, &lenw, &last, iwork, work); |
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232 |
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233 delete [] iwork; |
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234 delete [] work; |
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235 |
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236 return result; |
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237 } |
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238 |
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239 /* |
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240 ;;; Local Variables: *** |
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241 ;;; mode: C++ *** |
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242 ;;; page-delimiter: "^/\\*" *** |
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243 ;;; End: *** |
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244 */ |
