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1 /* |
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3 Copyright (C) 1996, 1997 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_Quad_h) |
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25 #define octave_Quad_h 1 |
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26 |
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27 #include <cfloat> |
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28 #include <cmath> |
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29 |
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30 #include "dColVector.h" |
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31 |
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32 #if !defined (octave_Quad_typedefs) |
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33 #define octave_Quad_typedefs 1 |
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34 |
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35 typedef double (*integrand_fcn) (double x); |
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36 |
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37 #endif |
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38 |
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39 // XXX FIXME XXX -- would be nice to not have to have this global |
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40 // variable. |
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41 // Nonzero means an error occurred in the calculation of the integrand |
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42 // function, and the user wants us to quit. |
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43 extern int quad_integration_error; |
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44 |
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45 #include "Quad-opts.h" |
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46 |
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47 class |
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48 Quad : public Quad_options |
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49 { |
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50 public: |
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51 |
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52 Quad (integrand_fcn fcn) |
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53 : Quad_options (), f (fcn) { } |
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54 |
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55 virtual ~Quad (void) { } |
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56 |
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57 virtual double integrate (void) |
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58 { |
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59 octave_idx_type ier, neval; |
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60 double abserr; |
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61 return do_integrate (ier, neval, abserr); |
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62 } |
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63 |
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64 virtual double integrate (octave_idx_type& ier) |
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65 { |
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66 octave_idx_type neval; |
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67 double abserr; |
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68 return do_integrate (ier, neval, abserr); |
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69 } |
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70 |
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71 virtual double integrate (octave_idx_type& ier, octave_idx_type& neval) |
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72 { |
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73 double abserr; |
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74 return do_integrate (ier, neval, abserr); |
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75 } |
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76 |
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77 virtual double integrate (octave_idx_type& ier, octave_idx_type& neval, double& abserr) |
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78 { |
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79 return do_integrate (ier, neval, abserr); |
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80 } |
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81 |
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82 virtual double do_integrate (octave_idx_type& ier, octave_idx_type& neval, double& abserr) = 0; |
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83 |
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84 protected: |
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85 |
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86 integrand_fcn f; |
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87 }; |
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88 |
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89 class |
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90 DefQuad : public Quad |
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91 { |
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92 public: |
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93 |
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94 DefQuad (integrand_fcn fcn) |
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95 : Quad (fcn), lower_limit (0.0), upper_limit (1.0), singularities () { } |
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96 |
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97 DefQuad (integrand_fcn fcn, double ll, double ul) |
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98 : Quad (fcn), lower_limit (ll), upper_limit (ul), singularities () { } |
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99 |
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100 DefQuad (integrand_fcn fcn, double ll, double ul, |
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101 const ColumnVector& sing) |
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102 : Quad (fcn), lower_limit (ll), upper_limit (ul), |
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103 singularities (sing) { } |
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104 |
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105 DefQuad (integrand_fcn fcn, const ColumnVector& sing) |
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106 : Quad (fcn), lower_limit (0.0), upper_limit (1.0), |
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107 singularities (sing) { } |
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108 |
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109 ~DefQuad (void) { } |
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110 |
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111 double do_integrate (octave_idx_type& ier, octave_idx_type& neval, double& abserr); |
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112 |
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113 private: |
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114 |
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115 double lower_limit; |
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116 double upper_limit; |
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117 |
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118 ColumnVector singularities; |
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119 }; |
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120 |
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121 class |
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122 IndefQuad : public Quad |
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123 { |
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124 public: |
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125 |
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126 enum IntegralType { bound_to_inf, neg_inf_to_bound, doubly_infinite }; |
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127 |
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128 IndefQuad (integrand_fcn fcn) |
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129 : Quad (fcn), bound (0.0), type (bound_to_inf) { } |
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130 |
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131 IndefQuad (integrand_fcn fcn, double b, IntegralType t) |
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132 : Quad (fcn), bound (b), type (t) { } |
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133 |
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134 ~IndefQuad (void) { } |
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135 |
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136 double do_integrate (octave_idx_type& ier, octave_idx_type& neval, double& abserr); |
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137 |
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138 private: |
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139 |
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140 double bound; |
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141 IntegralType type; |
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142 int integration_error; |
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143 }; |
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144 |
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145 #endif |
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146 |
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147 /* |
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148 ;;; Local Variables: *** |
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149 ;;; mode: C++ *** |
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150 ;;; End: *** |
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151 */ |
