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1 // f-inv.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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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 "dMatrix.h" |
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29 #include "CMatrix.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 "utils.h" |
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36 #include "help.h" |
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37 #include "defun-dld.h" |
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38 |
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39 DEFUN_DLD_BUILTIN ("inv", Finv, Sinv, 2, 1, |
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40 "inv (X): inverse of a square matrix") |
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41 { |
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42 Octave_object retval; |
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43 |
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44 int nargin = args.length (); |
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45 |
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46 if (nargin != 1) |
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47 { |
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48 print_usage ("inv"); |
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49 return retval; |
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50 } |
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51 |
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52 tree_constant arg = args(0); |
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53 |
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54 int nr = arg.rows (); |
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55 int nc = arg.columns (); |
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56 |
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57 int arg_is_empty = empty_arg ("inverse", nr, nc); |
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58 |
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59 if (arg_is_empty < 0) |
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60 return retval; |
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61 else if (arg_is_empty > 0) |
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62 return Matrix (); |
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63 |
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64 if (nr != nc) |
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65 { |
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66 gripe_square_matrix_required ("inverse"); |
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67 return retval; |
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68 } |
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69 |
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70 if (arg.is_real_type ()) |
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71 { |
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72 Matrix m = arg.matrix_value (); |
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73 |
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74 if (! error_state) |
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75 { |
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76 int info; |
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77 double rcond = 0.0; |
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78 |
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79 Matrix minv = m.inverse (info, rcond); |
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80 |
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81 if (info == -1) |
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82 warning ("inverse: matrix singular to machine precision,\ |
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83 rcond = %g", rcond); |
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84 else |
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85 retval = minv; |
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86 } |
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87 } |
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88 else if (arg.is_complex_type ()) |
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89 { |
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90 ComplexMatrix m = arg.complex_matrix_value (); |
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91 |
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92 if (! error_state) |
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93 { |
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94 int info; |
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95 double rcond = 0.0; |
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96 |
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97 ComplexMatrix minv = m.inverse (info, rcond); |
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98 |
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99 if (info == -1) |
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100 warning ("inverse: matrix singular to machine precision,\ |
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101 rcond = %g", rcond); |
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102 else |
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103 retval = minv; |
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104 } |
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105 } |
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106 else |
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107 { |
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108 gripe_wrong_type_arg ("inv", arg); |
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109 } |
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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 */ |
