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1 /* |
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2 |
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3 Copyright (C) 2004 David Bateman |
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4 Copyright (C) 1998-2004 Andy Adler |
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5 |
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6 Octave is free software; you can redistribute it and/or modify it |
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7 under the terms of the GNU General Public License as published by the |
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8 Free Software Foundation; either version 2, or (at your option) any |
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9 later version. |
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10 |
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11 Octave is distributed in the hope that it will be useful, but WITHOUT |
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 for more details. |
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15 |
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16 You should have received a copy of the GNU General Public License |
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17 along with this program; see the file COPYING. If not, write to the |
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18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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19 Boston, MA 02110-1301, USA. |
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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 "defun-dld.h" |
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28 #include "error.h" |
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29 #include "gripes.h" |
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30 #include "oct-obj.h" |
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31 #include "utils.h" |
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32 |
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33 #include "dbleDET.h" |
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34 #include "CmplxDET.h" |
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35 |
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36 #include "ov-re-sparse.h" |
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37 #include "ov-cx-sparse.h" |
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38 |
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39 // PKG_ADD: dispatch ("det", "spdet", "sparse matrix"); |
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40 // PKG_ADD: dispatch ("det", "spdet", "sparse complex matrix"); |
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41 // PKG_ADD: dispatch ("det", "spdet", "sparse bool matrix"); |
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42 DEFUN_DLD (spdet, args, , |
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43 "-*- texinfo -*-\n\ |
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44 @deftypefn {Loadable Function} {[@var{d}, @var{rcond}] = } spdet (@var{a})\n\ |
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45 Compute the determinant of sparse matrix @var{a} using UMFPACK. Return\n\ |
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46 an estimate of the reciprocal condition number if requested.\n\ |
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47 @end deftypefn") |
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48 { |
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49 octave_value_list retval; |
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50 |
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51 int nargin = args.length (); |
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52 |
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53 if (nargin != 1) |
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54 { |
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55 print_usage ("spdet"); |
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56 return retval; |
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57 } |
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58 |
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59 octave_value arg = args(0); |
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60 |
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61 octave_idx_type nr = arg.rows (); |
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62 octave_idx_type nc = arg.columns (); |
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63 |
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64 if (nr == 0 && nc == 0) |
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65 { |
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66 retval(0) = 1.0; |
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67 return retval; |
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68 } |
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69 |
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70 int arg_is_empty = empty_arg ("spdet", nr, nc); |
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71 if (arg_is_empty < 0) |
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72 return retval; |
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73 if (arg_is_empty > 0) |
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74 return octave_value (Matrix (1, 1, 1.0)); |
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75 |
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76 if (nr != nc) |
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77 { |
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78 gripe_square_matrix_required ("spdet"); |
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79 return retval; |
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80 } |
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81 |
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82 if (arg.is_real_type ()) |
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83 { |
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84 SparseMatrix m = args(0).sparse_matrix_value (); |
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85 |
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86 if (! error_state) |
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87 { |
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88 // Always compute rcond, so we can detect numerically |
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89 // singular matrices. |
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90 |
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91 octave_idx_type info; |
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92 double rcond = 0.0; |
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93 DET det = m.determinant (info, rcond); |
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94 retval(1) = rcond; |
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95 volatile double xrcond = rcond; |
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96 xrcond += 1.0; |
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97 retval(0) = ((info == -1 || xrcond == 1.0) ? 0.0 : det.value ()); |
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98 } |
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99 } |
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100 else if (arg.is_complex_type ()) |
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101 { |
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102 SparseComplexMatrix m = args(0).sparse_complex_matrix_value (); |
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103 |
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104 if (! error_state) |
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105 { |
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106 // Always compute rcond, so we can detect numerically |
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107 // singular matrices. |
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108 |
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109 octave_idx_type info; |
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110 double rcond = 0.0; |
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111 ComplexDET det = m.determinant (info, rcond); |
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112 retval(1) = rcond; |
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113 volatile double xrcond = rcond; |
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114 xrcond += 1.0; |
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115 retval(0) = ((info == -1 || xrcond == 1.0) |
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116 ? Complex (0.0) : det.value ()); |
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117 } |
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118 } |
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119 else |
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120 { |
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121 gripe_wrong_type_arg ("spdet", arg); |
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122 } |
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123 |
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124 return retval; |
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125 } |
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126 |
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127 /* |
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128 ;;; Local Variables: *** |
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129 ;;; mode: C++ *** |
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130 ;;; End: *** |
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131 */ |
