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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 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__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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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 <iostream> |
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32 |
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33 #include "CollocWt.h" |
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34 #include "f77-fcn.h" |
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35 #include "lo-error.h" |
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36 |
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37 extern "C" |
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38 { |
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39 F77_RET_T |
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40 F77_FUNC (jcobi, JCOBI) (int&, int&, int&, int&, double&, |
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41 double&, double*, double*, double*, |
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42 double*); |
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43 |
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44 F77_RET_T |
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45 F77_FUNC (dfopr, DFOPR) (int&, int&, int&, int&, int&, int&, |
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46 double*, double*, double*, double*, |
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47 double*); |
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48 } |
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49 |
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50 // Error handling. |
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51 |
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52 void |
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53 CollocWt::error (const char* msg) |
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54 { |
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55 (*current_liboctave_error_handler) ("fatal CollocWt error: %s", msg); |
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56 } |
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57 |
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58 CollocWt& |
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59 CollocWt::set_left (double val) |
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60 { |
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61 if (val >= rb) |
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62 { |
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63 error ("left bound greater than right bound"); |
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64 return *this; |
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65 } |
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66 |
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67 lb = val; |
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68 initialized = 0; |
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69 return *this; |
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70 } |
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71 |
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72 CollocWt& |
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73 CollocWt::set_right (double val) |
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74 { |
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75 if (val <= lb) |
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76 { |
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77 error ("right bound less than left bound"); |
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78 return *this; |
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79 } |
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80 |
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81 rb = val; |
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82 initialized = 0; |
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83 return *this; |
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84 } |
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85 |
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86 void |
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87 CollocWt::init (void) |
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88 { |
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89 // Check for possible errors. |
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90 |
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91 double wid = rb - lb; |
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92 if (wid <= 0.0) |
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93 { |
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94 error ("width less than or equal to zero"); |
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95 return; |
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96 } |
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97 |
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98 int nt = n + inc_left + inc_right; |
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99 |
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100 if (nt < 0) |
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101 { |
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102 error ("total number of collocation points less than zero"); |
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103 return; |
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104 } |
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105 else if (nt == 0) |
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106 return; |
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107 |
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108 Array<double> dif1 (nt); |
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109 double *pdif1 = dif1.fortran_vec (); |
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110 |
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111 Array<double> dif2 (nt); |
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112 double *pdif2 = dif2.fortran_vec (); |
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113 |
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114 Array<double> dif3 (nt); |
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115 double *pdif3 = dif3.fortran_vec (); |
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116 |
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117 Array<double> vect (nt); |
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118 double *pvect = vect.fortran_vec (); |
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119 |
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120 r.resize (nt); |
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121 q.resize (nt); |
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122 A.resize (nt, nt); |
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123 B.resize (nt, nt); |
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124 |
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125 double *pr = r.fortran_vec (); |
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126 |
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127 // Compute roots. |
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128 |
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129 F77_FUNC (jcobi, JCOBI) (nt, n, inc_left, inc_right, Alpha, Beta, |
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130 pdif1, pdif2, pdif3, pr); |
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131 |
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132 int id; |
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133 |
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134 // First derivative weights. |
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135 |
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136 id = 1; |
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137 for (int i = 1; i <= nt; i++) |
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138 { |
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139 F77_FUNC (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1, |
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140 pdif2, pdif3, pr, pvect); |
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141 |
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142 for (int j = 0; j < nt; j++) |
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143 A (i-1, j) = vect.elem (j); |
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144 } |
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145 |
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146 // Second derivative weights. |
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147 |
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148 id = 2; |
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149 for (int i = 1; i <= nt; i++) |
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150 { |
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151 F77_FUNC (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1, |
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152 pdif2, pdif3, pr, pvect); |
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153 |
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154 for (int j = 0; j < nt; j++) |
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155 B (i-1, j) = vect.elem (j); |
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156 } |
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157 |
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158 // Gaussian quadrature weights. |
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159 |
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160 id = 3; |
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161 double *pq = q.fortran_vec (); |
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162 F77_FUNC (dfopr, DFOPR) (nt, n, inc_left, inc_right, id, id, pdif1, |
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163 pdif2, pdif3, pr, pq); |
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164 |
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165 initialized = 1; |
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166 } |
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167 |
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168 std::ostream& |
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169 operator << (std::ostream& os, const CollocWt& a) |
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170 { |
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171 if (a.left_included ()) |
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172 os << "left boundary is included\n"; |
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173 else |
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174 os << "left boundary is not included\n"; |
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175 |
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176 if (a.right_included ()) |
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177 os << "right boundary is included\n"; |
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178 else |
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179 os << "right boundary is not included\n"; |
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180 |
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181 os << "\n"; |
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182 |
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183 os << a.Alpha << " " << a.Beta << "\n\n" |
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184 << a.r << "\n\n" |
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185 << a.q << "\n\n" |
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186 << a.A << "\n" |
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187 << a.B << "\n"; |
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188 |
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189 return os; |
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190 } |
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191 |
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192 /* |
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193 ;;; Local Variables: *** |
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194 ;;; mode: C++ *** |
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195 ;;; End: *** |
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196 */ |
