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1 /* |
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2 |
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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 3 of the License, or (at your |
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10 option) any 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, see |
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19 <http://www.gnu.org/licenses/>. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <iostream> |
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28 |
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29 #include "CollocWt.h" |
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30 #include "f77-fcn.h" |
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31 #include "lo-error.h" |
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32 |
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33 extern "C" |
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34 { |
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35 F77_RET_T |
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36 F77_FUNC (jcobi, JCOBI) (octave_idx_type&, octave_idx_type&, octave_idx_type&, octave_idx_type&, double&, |
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37 double&, double*, double*, double*, |
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38 double*); |
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39 |
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40 F77_RET_T |
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41 F77_FUNC (dfopr, DFOPR) (octave_idx_type&, octave_idx_type&, octave_idx_type&, octave_idx_type&, octave_idx_type&, octave_idx_type&, |
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42 double*, double*, double*, double*, |
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43 double*); |
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44 } |
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45 |
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46 // Error handling. |
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47 |
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48 void |
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49 CollocWt::error (const char* msg) |
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50 { |
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51 (*current_liboctave_error_handler) ("fatal CollocWt error: %s", msg); |
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52 } |
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53 |
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54 CollocWt& |
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55 CollocWt::set_left (double val) |
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56 { |
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57 if (val >= rb) |
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58 { |
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59 error ("left bound greater than right bound"); |
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60 return *this; |
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61 } |
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62 |
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63 lb = val; |
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64 initialized = 0; |
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65 return *this; |
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66 } |
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67 |
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68 CollocWt& |
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69 CollocWt::set_right (double val) |
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70 { |
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71 if (val <= lb) |
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72 { |
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73 error ("right bound less than left bound"); |
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74 return *this; |
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75 } |
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76 |
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77 rb = val; |
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78 initialized = 0; |
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79 return *this; |
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80 } |
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81 |
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82 void |
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83 CollocWt::init (void) |
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84 { |
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85 // Check for possible errors. |
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86 |
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87 double wid = rb - lb; |
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88 if (wid <= 0.0) |
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89 { |
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90 error ("width less than or equal to zero"); |
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91 return; |
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92 } |
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93 |
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94 octave_idx_type nt = n + inc_left + inc_right; |
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95 |
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96 if (nt < 0) |
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97 { |
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98 error ("total number of collocation points less than zero"); |
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99 return; |
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100 } |
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101 else if (nt == 0) |
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102 return; |
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103 |
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104 Array<double> dif1 (nt); |
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105 double *pdif1 = dif1.fortran_vec (); |
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106 |
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107 Array<double> dif2 (nt); |
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108 double *pdif2 = dif2.fortran_vec (); |
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109 |
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110 Array<double> dif3 (nt); |
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111 double *pdif3 = dif3.fortran_vec (); |
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112 |
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113 Array<double> vect (nt); |
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114 double *pvect = vect.fortran_vec (); |
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115 |
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116 r.resize (nt); |
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117 q.resize (nt); |
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118 A.resize (nt, nt); |
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119 B.resize (nt, nt); |
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120 |
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121 double *pr = r.fortran_vec (); |
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122 |
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123 // Compute roots. |
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124 |
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125 F77_FUNC (jcobi, JCOBI) (nt, n, inc_left, inc_right, Alpha, Beta, |
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126 pdif1, pdif2, pdif3, pr); |
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127 |
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128 octave_idx_type id; |
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129 |
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130 // First derivative weights. |
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131 |
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132 id = 1; |
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133 for (octave_idx_type i = 1; i <= nt; i++) |
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134 { |
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135 F77_FUNC (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1, |
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136 pdif2, pdif3, pr, pvect); |
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137 |
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138 for (octave_idx_type j = 0; j < nt; j++) |
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139 A (i-1, j) = vect.elem (j); |
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140 } |
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141 |
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142 // Second derivative weights. |
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143 |
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144 id = 2; |
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145 for (octave_idx_type i = 1; i <= nt; i++) |
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146 { |
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147 F77_FUNC (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1, |
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148 pdif2, pdif3, pr, pvect); |
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149 |
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150 for (octave_idx_type j = 0; j < nt; j++) |
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151 B (i-1, j) = vect.elem (j); |
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152 } |
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153 |
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154 // Gaussian quadrature weights. |
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155 |
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156 id = 3; |
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157 double *pq = q.fortran_vec (); |
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158 F77_FUNC (dfopr, DFOPR) (nt, n, inc_left, inc_right, id, id, pdif1, |
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159 pdif2, pdif3, pr, pq); |
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160 |
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161 initialized = 1; |
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162 } |
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163 |
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164 std::ostream& |
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165 operator << (std::ostream& os, const CollocWt& a) |
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166 { |
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167 if (a.left_included ()) |
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168 os << "left boundary is included\n"; |
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169 else |
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170 os << "left boundary is not included\n"; |
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171 |
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172 if (a.right_included ()) |
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173 os << "right boundary is included\n"; |
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174 else |
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175 os << "right boundary is not included\n"; |
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176 |
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177 os << "\n"; |
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178 |
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179 os << a.Alpha << " " << a.Beta << "\n\n" |
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180 << a.r << "\n\n" |
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181 << a.q << "\n\n" |
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182 << a.A << "\n" |
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183 << a.B << "\n"; |
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184 |
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185 return os; |
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186 } |
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187 |
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188 /* |
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189 ;;; Local Variables: *** |
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190 ;;; mode: C++ *** |
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191 ;;; End: *** |
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192 */ |
