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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__) |
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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.h> |
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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 int F77_FCN (jcobi, JCOBI) (int&, int&, int&, int&, double&, |
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40 double&, double*, double*, double*, |
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41 double*); |
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42 |
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43 int F77_FCN (dfopr, DFOPR) (int&, int&, int&, int&, int&, int&, |
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44 double*, double*, double*, double*, |
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45 double*); |
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46 } |
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47 |
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48 // Error handling. |
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49 |
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50 void |
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51 CollocWt::error (const char* msg) |
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52 { |
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53 (*current_liboctave_error_handler) ("fatal CollocWt error: %s", msg); |
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54 } |
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55 |
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56 CollocWt& |
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57 CollocWt::set_left (double val) |
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58 { |
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59 if (val >= rb) |
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60 { |
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61 error ("left bound greater than right bound"); |
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62 return *this; |
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63 } |
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64 |
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65 lb = val; |
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66 initialized = 0; |
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67 return *this; |
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68 } |
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69 |
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70 CollocWt& |
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71 CollocWt::set_right (double val) |
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72 { |
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73 if (val <= lb) |
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74 { |
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75 error ("right bound less than left bound"); |
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76 return *this; |
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77 } |
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78 |
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79 rb = val; |
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80 initialized = 0; |
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81 return *this; |
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82 } |
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83 |
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84 void |
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85 CollocWt::init (void) |
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86 { |
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87 // Check for possible errors. |
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88 |
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89 double wid = rb - lb; |
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90 if (wid <= 0.0) |
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91 { |
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92 error ("width less than or equal to zero"); |
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93 return; |
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94 } |
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95 |
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96 int nt = n + inc_left + inc_right; |
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97 |
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98 if (nt < 0) |
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99 { |
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100 error ("total number of collocation points less than zero"); |
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101 return; |
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102 } |
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103 else if (nt == 0) |
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104 return; |
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105 |
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106 Array<double> dif1 (nt); |
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107 double *pdif1 = dif1.fortran_vec (); |
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108 |
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109 Array<double> dif2 (nt); |
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110 double *pdif2 = dif2.fortran_vec (); |
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111 |
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112 Array<double> dif3 (nt); |
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113 double *pdif3 = dif3.fortran_vec (); |
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114 |
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115 Array<double> vect (nt); |
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116 double *pvect = vect.fortran_vec (); |
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117 |
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118 r.resize (nt); |
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119 q.resize (nt); |
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120 A.resize (nt, nt); |
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121 B.resize (nt, nt); |
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122 |
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123 double *pr = r.fortran_vec (); |
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124 |
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125 // Compute roots. |
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126 |
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127 F77_FCN (jcobi, JCOBI) (nt, n, inc_left, inc_right, Alpha, Beta, |
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128 pdif1, pdif2, pdif3, pr); |
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129 |
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130 int id; |
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131 |
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132 // First derivative weights. |
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133 |
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134 id = 1; |
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135 for (int i = 1; i <= nt; i++) |
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136 { |
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137 F77_FCN (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1, |
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138 pdif2, pdif3, pr, pvect); |
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139 |
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140 for (int j = 0; j < nt; j++) |
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141 A (i-1, j) = vect.elem (j); |
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142 } |
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143 |
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144 // Second derivative weights. |
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145 |
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146 id = 2; |
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147 for (int i = 1; i <= nt; i++) |
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148 { |
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149 F77_FCN (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1, |
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150 pdif2, pdif3, pr, pvect); |
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151 |
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152 for (int j = 0; j < nt; j++) |
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153 B (i-1, j) = vect.elem (j); |
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154 } |
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155 |
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156 // Gaussian quadrature weights. |
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157 |
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158 id = 3; |
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159 double *pq = q.fortran_vec (); |
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160 F77_FCN (dfopr, DFOPR) (nt, n, inc_left, inc_right, id, id, pdif1, |
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161 pdif2, pdif3, pr, pq); |
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162 |
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163 initialized = 1; |
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164 } |
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165 |
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166 ostream& |
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167 operator << (ostream& os, const CollocWt& a) |
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168 { |
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169 if (a.left_included ()) |
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170 os << "left boundary is included\n"; |
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171 else |
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172 os << "left boundary is not included\n"; |
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173 |
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174 if (a.right_included ()) |
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175 os << "right boundary is included\n"; |
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176 else |
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177 os << "right boundary is not included\n"; |
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178 |
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179 os << "\n"; |
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180 |
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181 os << a.Alpha << " " << a.Beta << "\n\n" |
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182 << a.r << "\n\n" |
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183 << a.q << "\n\n" |
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184 << a.A << "\n" |
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185 << a.B << "\n"; |
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186 |
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187 return os; |
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188 } |
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189 |
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190 /* |
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191 ;;; Local Variables: *** |
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192 ;;; mode: C++ *** |
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193 ;;; End: *** |
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194 */ |
