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1 // f-chol.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993, 1994 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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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 "dbleCHOL.h" |
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29 #include "CmplxCHOL.h" |
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30 |
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31 #include "tree-const.h" |
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32 #include "user-prefs.h" |
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33 #include "gripes.h" |
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34 #include "error.h" |
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35 #include "help.h" |
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36 #include "defun-dld.h" |
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37 |
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38 DEFUN_DLD ("chol", Fchol, Schol, 2, 1, |
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39 "R = chol (X): cholesky factorization") |
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40 { |
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41 Octave_object retval; |
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42 |
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43 int nargin = args.length (); |
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44 |
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45 if (nargin != 2 || nargout > 1) |
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46 { |
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47 print_usage ("chol"); |
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48 return retval; |
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49 } |
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50 |
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51 tree_constant tmp = args(1).make_numeric (); |
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52 |
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53 int nr = tmp.rows (); |
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54 int nc = tmp.columns (); |
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55 |
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56 if (nr == 0 || nc == 0) |
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57 { |
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58 int flag = user_pref.propagate_empty_matrices; |
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59 if (flag != 0) |
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60 { |
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61 if (flag < 0) |
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62 gripe_empty_arg ("chol", 0); |
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63 |
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64 retval.resize (1, Matrix ()); |
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65 } |
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66 else |
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67 gripe_empty_arg ("chol", 1); |
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68 |
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69 return retval; |
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70 } |
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71 |
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72 switch (tmp.const_type ()) |
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73 { |
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74 case tree_constant_rep::matrix_constant: |
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75 { |
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76 Matrix m = tmp.matrix_value (); |
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77 int info; |
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78 CHOL fact (m, info); |
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79 if (info != 0) |
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80 error ("chol: matrix not positive definite"); |
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81 else |
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82 retval = fact.chol_matrix (); |
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83 } |
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84 break; |
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85 case tree_constant_rep::complex_matrix_constant: |
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86 { |
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87 ComplexMatrix m = tmp.complex_matrix_value (); |
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88 int info; |
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89 ComplexCHOL fact (m, info); |
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90 if (info != 0) |
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91 error ("chol: matrix not positive definite"); |
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92 else |
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93 retval = fact.chol_matrix (); |
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94 } |
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95 break; |
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96 case tree_constant_rep::scalar_constant: |
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97 { |
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98 double d = tmp.double_value (); |
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99 retval = d; |
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100 } |
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101 break; |
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102 case tree_constant_rep::complex_scalar_constant: |
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103 { |
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104 Complex c = tmp.complex_value (); |
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105 retval = c; |
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106 } |
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107 break; |
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108 default: |
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109 break; |
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110 } |
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111 return retval; |
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112 } |
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113 |
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114 /* |
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115 ;;; Local Variables: *** |
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116 ;;; mode: C++ *** |
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117 ;;; page-delimiter: "^/\\*" *** |
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118 ;;; End: *** |
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119 */ |
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120 |
