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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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24 #ifdef __GNUG__ |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #include <iostream.h> |
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29 #include "Quad.h" |
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30 #include "f77-uscore.h" |
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31 #include "sun-utils.h" |
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32 |
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33 static integrand_fcn user_fcn; |
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34 |
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35 extern "C" |
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36 { |
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37 int F77_FCN (dqagp) (const double (*)(double*), const double*, |
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38 const double*, const int*, const double*, |
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39 const double*, const double*, double*, double*, |
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40 int*, int*, const int*, const int*, int*, int*, |
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41 double*); |
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42 |
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43 int F77_FCN (dqagi) (const double (*)(double*), const double*, |
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44 const int*, const double*, const double*, |
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45 double*, double*, int*, int*, const int*, |
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46 const int*, int*, int*, double*); |
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47 } |
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48 |
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49 Quad::Quad (integrand_fcn fcn) |
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50 { |
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51 absolute_tolerance = 1.0e-6; |
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52 relative_tolerance = 1.0e-6; |
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53 f = fcn; |
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54 } |
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55 |
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56 Quad::Quad (integrand_fcn fcn, double abs, double rel) |
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57 { |
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58 absolute_tolerance = abs; |
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59 relative_tolerance = rel; |
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60 f = fcn; |
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61 } |
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62 |
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63 double |
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64 Quad::integrate (void) |
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65 { |
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66 int ier, neval; |
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67 double abserr; |
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68 return integrate (ier, neval, abserr); |
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69 } |
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70 |
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71 double |
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72 Quad::integrate (int& ier) |
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73 { |
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74 int neval; |
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75 double abserr; |
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76 return integrate (ier, neval, abserr); |
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77 } |
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78 |
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79 double |
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80 Quad::integrate (int& ier, int& neval) |
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81 { |
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82 double abserr; |
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83 return integrate (ier, neval, abserr); |
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84 } |
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85 |
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86 static double |
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87 user_function (double *x) |
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88 { |
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89 #if defined (sun) && defined (__GNUC__) |
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90 double xx = access_double (x); |
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91 #else |
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92 double xx = *x; |
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93 #endif |
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94 |
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95 return (*user_fcn) (xx); |
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96 } |
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97 |
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98 DefQuad::DefQuad (integrand_fcn fcn) : Quad (fcn) |
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99 { |
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100 lower_limit = 0.0; |
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101 upper_limit = 1.0; |
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102 } |
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103 |
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104 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul) |
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105 : Quad (fcn) |
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106 { |
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107 lower_limit = ll; |
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108 upper_limit = ul; |
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109 } |
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110 |
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111 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul, |
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112 double abs, double rel) : Quad (fcn, abs, rel) |
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113 { |
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114 lower_limit = ll; |
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115 upper_limit = ul; |
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116 } |
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117 |
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118 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul, |
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119 const Vector& sing) : Quad (fcn) |
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120 { |
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121 lower_limit = ll; |
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122 upper_limit = ul; |
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123 singularities = sing; |
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124 } |
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125 |
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126 DefQuad::DefQuad (integrand_fcn fcn, const Vector& sing, |
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127 double abs, double rel) : Quad (fcn, abs, rel) |
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128 { |
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129 lower_limit = 0.0; |
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130 upper_limit = 1.0; |
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131 singularities = sing; |
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132 } |
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133 |
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134 DefQuad::DefQuad (integrand_fcn fcn, const Vector& sing) |
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135 : Quad (fcn) |
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136 { |
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137 lower_limit = 0.0; |
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138 upper_limit = 1.0; |
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139 singularities = sing; |
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140 } |
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141 |
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142 DefQuad::DefQuad (integrand_fcn fcn, double ll, double ul, |
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143 const Vector& sing, double abs, double rel) |
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144 : Quad (fcn, abs, rel) |
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145 { |
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146 lower_limit = ll; |
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147 upper_limit = ul; |
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148 singularities = sing; |
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149 } |
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150 |
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151 double |
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152 DefQuad::integrate (int& ier, int& neval, double& abserr) |
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153 { |
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154 int npts = singularities.capacity () + 2; |
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155 double *points = singularities.fortran_vec (); |
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156 double result = 0.0; |
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157 int leniw = 183*npts - 122; |
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158 int lenw = 2*leniw - npts; |
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159 int *iwork = new int [leniw]; |
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160 double *work = new double [lenw]; |
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161 user_fcn = f; |
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162 int last; |
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163 |
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164 F77_FCN (dqagp) (user_function, &lower_limit, &upper_limit, &npts, |
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165 points, &absolute_tolerance, &relative_tolerance, |
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166 &result, &abserr, &neval, &ier, &leniw, &lenw, |
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167 &last, iwork, work); |
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168 |
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169 delete [] iwork; |
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170 delete [] work; |
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171 |
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172 return result; |
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173 } |
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174 |
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175 IndefQuad::IndefQuad (integrand_fcn fcn) : Quad (fcn) |
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176 { |
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177 bound = 0.0; |
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178 type = bound_to_inf; |
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179 } |
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180 |
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181 IndefQuad::IndefQuad (integrand_fcn fcn, double b, IntegralType t) |
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182 : Quad (fcn) |
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183 { |
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184 bound = b; |
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185 type = t; |
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186 } |
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187 |
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188 IndefQuad::IndefQuad (integrand_fcn fcn, double b, IntegralType t, |
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189 double abs, double rel) : Quad (fcn, abs, rel) |
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190 { |
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191 bound = b; |
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192 type = t; |
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193 } |
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194 |
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195 IndefQuad::IndefQuad (integrand_fcn fcn, double abs, double rel) |
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196 : Quad (fcn, abs, rel) |
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197 { |
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198 bound = 0.0; |
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199 type = bound_to_inf; |
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200 } |
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201 |
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202 double |
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203 IndefQuad::integrate (int& ier, int& neval, double& abserr) |
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204 { |
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205 double result = 0.0; |
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206 int leniw = 128; |
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207 int lenw = 8*leniw; |
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208 int *iwork = new int [leniw]; |
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209 double *work = new double [lenw]; |
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210 user_fcn = f; |
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211 int last; |
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212 |
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213 int inf; |
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214 switch (type) |
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215 { |
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216 case bound_to_inf: |
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217 inf = 1; |
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218 break; |
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219 case neg_inf_to_bound: |
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220 inf = -1; |
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221 break; |
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222 case doubly_infinite: |
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223 inf = 2; |
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224 break; |
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225 default: |
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226 assert (0); |
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227 break; |
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228 } |
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229 |
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230 F77_FCN (dqagi) (user_function, &bound, &inf, &absolute_tolerance, |
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231 &relative_tolerance, &result, &abserr, &neval, |
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232 &ier, &leniw, &lenw, &last, iwork, work); |
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233 |
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234 delete [] iwork; |
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235 delete [] work; |
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236 |
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237 return result; |
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238 } |
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239 |
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240 /* |
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241 ;;; Local Variables: *** |
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242 ;;; mode: C++ *** |
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243 ;;; page-delimiter: "^/\\*" *** |
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244 ;;; End: *** |
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245 */ |
