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1 /* |
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3 Copyright (C) 1996 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 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include "Quad.h" |
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32 #include "f77-fcn.h" |
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33 #include "sun-utils.h" |
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34 |
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35 static integrand_fcn user_fcn; |
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36 |
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37 // XXX FIXME XXX -- would be nice to not have to have this global |
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38 // variable. |
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39 // Nonzero means an error occurred in the calculation of the integrand |
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40 // function, and the user wants us to quit. |
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41 int quad_integration_error = 0; |
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42 |
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43 extern "C" |
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44 { |
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45 int F77_FCN (dqagp, DQAGP) (const double (*)(double*, int&), |
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46 const double&, const double&, |
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47 const int&, const double*, |
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48 const double&, const double&, double&, |
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49 double&, int&, int&, const int&, |
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50 const int&, int&, int*, double*); |
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51 |
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52 int F77_FCN (dqagi, DQAGI) (const double (*)(double*, int&), |
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53 const double&, const int&, |
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54 const double&, const double&, double&, |
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55 double&, int&, int&, const int&, |
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56 const int&, int&, int*, double*); |
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57 } |
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58 |
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59 static double |
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60 user_function (double *x, int& ierr) |
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61 { |
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62 #if defined (sun) && defined (__GNUC__) |
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63 double xx = access_double (x); |
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64 #else |
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65 double xx = *x; |
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66 #endif |
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67 |
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68 quad_integration_error = 0; |
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69 |
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70 double retval = (*user_fcn) (xx); |
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71 |
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72 if (quad_integration_error) |
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73 ierr = -1; |
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74 |
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75 return retval; |
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76 } |
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77 |
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78 double |
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79 DefQuad::integrate (int& ier, int& neval, double& abserr) |
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80 { |
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81 int npts = singularities.capacity () + 2; |
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82 double *points = singularities.fortran_vec (); |
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83 double result = 0.0; |
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84 |
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85 int leniw = 183*npts - 122; |
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86 Array<int> iwork (leniw); |
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87 int *piwork = iwork.fortran_vec (); |
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88 |
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89 int lenw = 2*leniw - npts; |
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90 Array<double> work (lenw); |
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91 double *pwork = work.fortran_vec (); |
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92 |
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93 user_fcn = f; |
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94 int last; |
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95 |
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96 double abs_tol = absolute_tolerance (); |
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97 double rel_tol = relative_tolerance (); |
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98 |
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99 F77_XFCN (dqagp, DQAGP, (user_function, lower_limit, upper_limit, |
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100 npts, points, abs_tol, rel_tol, result, |
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101 abserr, neval, ier, leniw, lenw, last, |
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102 piwork, pwork)); |
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103 |
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104 if (f77_exception_encountered) |
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105 (*current_liboctave_error_handler) ("unrecoverable error in dqagp"); |
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106 |
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107 return result; |
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108 } |
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109 |
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110 double |
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111 IndefQuad::integrate (int& ier, int& neval, double& abserr) |
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112 { |
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113 double result = 0.0; |
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114 |
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115 int leniw = 128; |
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116 Array<int> iwork (leniw); |
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117 int *piwork = iwork.fortran_vec (); |
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118 |
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119 int lenw = 8*leniw; |
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120 Array<double> work (lenw); |
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121 double *pwork = work.fortran_vec (); |
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122 |
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123 user_fcn = f; |
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124 int last; |
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125 |
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126 int inf; |
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127 switch (type) |
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128 { |
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129 case bound_to_inf: |
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130 inf = 1; |
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131 break; |
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132 |
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133 case neg_inf_to_bound: |
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134 inf = -1; |
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135 break; |
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136 |
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137 case doubly_infinite: |
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138 inf = 2; |
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139 break; |
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140 |
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141 default: |
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142 assert (0); |
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143 break; |
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144 } |
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145 |
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146 double abs_tol = absolute_tolerance (); |
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147 double rel_tol = relative_tolerance (); |
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148 |
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149 F77_XFCN (dqagi, DQAGI, (user_function, bound, inf, abs_tol, rel_tol, |
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150 result, abserr, neval, ier, leniw, lenw, |
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151 last, piwork, pwork)); |
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152 |
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153 if (f77_exception_encountered) |
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154 (*current_liboctave_error_handler) ("unrecoverable error in dqagi"); |
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155 |
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156 return result; |
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157 } |
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158 |
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159 /* |
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160 ;;; Local Variables: *** |
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161 ;;; mode: C++ *** |
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162 ;;; End: *** |
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163 */ |
