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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, 1994, 1995 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include "Quad.h" |
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33 #include "f77-fcn.h" |
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34 #include "sun-utils.h" |
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35 |
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36 static integrand_fcn user_fcn; |
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37 |
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38 // XXX FIXME XXX -- would be nice to not have to have this global |
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39 // variable. |
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40 // Nonzero means an error occurred in the calculation of the integrand |
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41 // function, and the user wants us to quit. |
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42 int quad_integration_error = 0; |
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43 |
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44 extern "C" |
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45 { |
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46 int F77_FCN (dqagp, DQAGP) (const double (*)(double*, int&), |
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47 const double&, const double&, |
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48 const int&, const double*, |
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49 const double&, const double&, double&, |
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50 double&, int&, int&, const int&, |
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51 const int&, int&, int*, double*); |
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52 |
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53 int F77_FCN (dqagi, DQAGI) (const double (*)(double*, int&), |
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54 const double&, const int&, |
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55 const double&, const double&, double&, |
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56 double&, int&, int&, const int&, |
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57 const int&, int&, int*, double*); |
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58 } |
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59 |
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60 static double |
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61 user_function (double *x, int& ierr) |
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62 { |
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63 #if defined (sun) && defined (__GNUC__) |
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64 double xx = access_double (x); |
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65 #else |
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66 double xx = *x; |
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67 #endif |
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68 |
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69 quad_integration_error = 0; |
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70 |
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71 double retval = (*user_fcn) (xx); |
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72 |
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73 if (quad_integration_error) |
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74 ierr = -1; |
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75 |
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76 return retval; |
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77 } |
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78 |
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79 double |
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80 DefQuad::integrate (int& ier, int& neval, double& abserr) |
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81 { |
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82 int npts = singularities.capacity () + 2; |
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83 double *points = singularities.fortran_vec (); |
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84 double result = 0.0; |
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85 int leniw = 183*npts - 122; |
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86 int lenw = 2*leniw - npts; |
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87 int *iwork = new int [leniw]; |
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88 double *work = new double [lenw]; |
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89 user_fcn = f; |
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90 int last; |
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91 |
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92 double abs_tol = absolute_tolerance (); |
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93 double rel_tol = relative_tolerance (); |
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94 |
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95 F77_FCN (dqagp, DQAGP) (user_function, lower_limit, upper_limit, |
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96 npts, points, abs_tol, rel_tol, result, |
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97 abserr, neval, ier, leniw, lenw, last, |
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98 iwork, work); |
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99 |
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100 delete [] iwork; |
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101 delete [] work; |
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102 |
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103 return result; |
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104 } |
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105 |
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106 double |
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107 IndefQuad::integrate (int& ier, int& neval, double& abserr) |
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108 { |
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109 double result = 0.0; |
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110 int leniw = 128; |
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111 int lenw = 8*leniw; |
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112 int *iwork = new int [leniw]; |
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113 double *work = new double [lenw]; |
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114 user_fcn = f; |
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115 int last; |
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116 |
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117 int inf; |
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118 switch (type) |
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119 { |
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120 case bound_to_inf: |
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121 inf = 1; |
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122 break; |
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123 |
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124 case neg_inf_to_bound: |
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125 inf = -1; |
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126 break; |
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127 |
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128 case doubly_infinite: |
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129 inf = 2; |
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130 break; |
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131 |
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132 default: |
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133 assert (0); |
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134 break; |
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135 } |
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136 |
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137 double abs_tol = absolute_tolerance (); |
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138 double rel_tol = relative_tolerance (); |
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139 |
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140 F77_FCN (dqagi, DQAGI) (user_function, bound, inf, abs_tol, rel_tol, |
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141 result, abserr, neval, ier, leniw, lenw, |
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142 last, iwork, work); |
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143 |
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144 delete [] iwork; |
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145 delete [] work; |
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146 |
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147 return result; |
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148 } |
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149 |
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150 /* |
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151 ;;; Local Variables: *** |
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152 ;;; mode: C++ *** |
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153 ;;; page-delimiter: "^/\\*" *** |
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154 ;;; End: *** |
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155 */ |
