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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 #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 DEFUN_DLD (pinv, args, , |
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34 "-*- texinfo -*-\n\ |
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35 @deftypefn {Loadable Function} {} pinv (@var{x}, @var{tol})\n\ |
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36 Return the pseudoinverse of @var{x}. Singular values less than\n\ |
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37 @var{tol} are ignored. \n\ |
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38 \n\ |
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39 If the second argument is omitted, it is assumed that\n\ |
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40 \n\ |
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41 @example\n\ |
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42 tol = max (size (@var{x})) * sigma_max (@var{x}) * eps,\n\ |
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43 @end example\n\ |
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44 \n\ |
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45 @noindent\n\ |
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46 where @code{sigma_max (@var{x})} is the maximal singular value of @var{x}.\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 || nargin > 2) |
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54 { |
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55 print_usage ("pinv"); |
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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 double tol = 0.0; |
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62 if (nargin == 2) |
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63 tol = args(1).double_value (); |
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64 |
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65 if (error_state) |
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66 return retval; |
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67 |
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68 if (tol < 0.0) |
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69 { |
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70 error ("pinv: tol must be greater than zero"); |
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71 return retval; |
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72 } |
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73 |
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74 int arg_is_empty = empty_arg ("pinv", arg.rows (), arg.columns ()); |
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75 |
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76 if (arg_is_empty < 0) |
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77 return retval; |
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78 else if (arg_is_empty > 0) |
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79 return Matrix (); |
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80 |
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81 if (arg.is_real_type ()) |
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82 { |
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83 Matrix m = arg.matrix_value (); |
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84 |
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85 if (! error_state) |
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86 retval = m.pseudo_inverse (tol); |
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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 retval = m.pseudo_inverse (tol); |
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94 } |
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95 else |
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96 { |
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97 gripe_wrong_type_arg ("pinv", arg); |
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98 } |
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99 |
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100 return retval; |
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101 } |
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102 |
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103 /* |
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104 ;;; Local Variables: *** |
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105 ;;; mode: C++ *** |
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106 ;;; End: *** |
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107 */ |
