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1 // f-colloc.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993, 1994, 1995 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include "CollocWt.h" |
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29 |
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30 #include "tree-const.h" |
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31 #include "error.h" |
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32 #include "utils.h" |
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33 #include "help.h" |
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519
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34 #include "defun-dld.h" |
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35 |
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36 DEFUN_DLD_BUILTIN ("colloc", Fcolloc, Scolloc, 7, 4, |
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37 "[R, A, B, Q] = colloc (N [, \"left\"] [, \"right\"]): collocation weights") |
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38 { |
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39 Octave_object retval; |
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40 |
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41 int nargin = args.length (); |
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42 |
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43 if (nargin < 1 || nargin > 3) |
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44 { |
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45 print_usage ("colloc"); |
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46 return retval; |
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47 } |
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48 |
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712
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49 if (! args(0).is_scalar_type ()) |
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50 { |
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51 error ("colloc: first argument must be a scalar"); |
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52 return retval; |
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53 } |
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54 |
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55 double tmp = args(0).double_value (); |
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56 |
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57 if (error_state) |
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58 return retval; |
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59 |
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60 int ncol = NINT (tmp); |
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61 if (ncol < 0) |
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62 { |
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63 error ("colloc: first argument must be non-negative"); |
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64 return retval; |
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65 } |
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66 |
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67 int ntot = ncol; |
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68 int left = 0; |
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69 int right = 0; |
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70 |
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71 for (int i = 1; i < nargin; i++) |
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72 { |
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73 if (args(i).is_defined ()) |
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74 { |
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75 if (! args(i).is_string ()) |
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76 { |
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77 error ("colloc: expecting string argument"); |
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78 return retval; |
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79 } |
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80 |
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81 char *s = args(i).string_value (); |
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82 |
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83 if (s && (((*s == 'R' || *s == 'r') && strlen (s) == 1) |
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84 || strcmp (s, "right") == 0)) |
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85 { |
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86 right = 1; |
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87 } |
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88 else if (s && (((*s == 'L' || *s == 'l') && strlen (s) == 1) |
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89 || strcmp (s, "left") == 0)) |
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90 { |
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91 left = 1; |
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92 } |
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93 else |
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94 { |
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95 error ("colloc: unrecognized argument"); |
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96 return retval; |
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97 } |
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98 } |
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99 else |
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100 { |
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101 error ("colloc: unexpected NULL argument"); |
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102 return retval; |
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103 } |
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104 } |
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105 |
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106 ntot += left + right; |
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107 if (ntot < 1) |
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108 { |
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109 error ("colloc: the total number of roots must be positive"); |
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110 return retval; |
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111 } |
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112 |
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113 CollocWt wts (ncol, left, right); |
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114 |
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115 ColumnVector r = wts.roots (); |
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116 Matrix A = wts.first (); |
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117 Matrix B = wts.second (); |
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118 ColumnVector q = wts.quad_weights (); |
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119 |
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120 retval(3) = q; |
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121 retval(2) = B; |
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122 retval(1) = A; |
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123 retval(0) = r; |
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124 |
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125 return retval; |
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126 } |
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127 |
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128 /* |
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129 ;;; Local Variables: *** |
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130 ;;; mode: C++ *** |
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131 ;;; page-delimiter: "^/\\*" *** |
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132 ;;; End: *** |
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133 */ |
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134 |
