Mercurial > hg > octave-avbm
changeset 700:5d852fb75139
[project @ 1994-09-15 02:23:24 by jwe]
Initial revision
author | jwe |
---|---|
date | Thu, 15 Sep 1994 02:23:24 +0000 |
parents | e380975350e5 |
children | 0a81458ef677 |
files | src/pinv.cc |
diffstat | 1 files changed, 102 insertions(+), 0 deletions(-) [+] |
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new file mode 100644 --- /dev/null +++ b/src/pinv.cc @@ -0,0 +1,102 @@ +// f-pinv.cc -*- C++ -*- +/* + +Copyright (C) 1994 John W. Eaton + +This file is part of Octave. + +Octave is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by the +Free Software Foundation; either version 2, or (at your option) any +later version. + +Octave is distributed in the hope that it will be useful, but WITHOUT +ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with Octave; see the file COPYING. If not, write to the Free +Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "dMatrix.h" +#include "CMatrix.h" + +#include "tree-const.h" +#include "user-prefs.h" +#include "gripes.h" +#include "error.h" +#include "utils.h" +#include "help.h" +#include "defun-dld.h" + +DEFUN_DLD_BUILTIN ("pinv", Fpinv, Spinv, 3, 1, + "pinv ( [, tol])\n\ +Returns the pseudoinverse of X; singular values less than tol are ignored.") +{ + Octave_object retval; + + int nargin = args.length (); + + if (nargin < 2 || nargin > 3) + { + print_usage ("pinv"); + return retval; + } + + tree_constant arg = args(1); + + double tol = 0.0; + if (nargin == 3) + tol = args(2).double_value (); + + if (error_state) + return retval; + + if (tol < 0.0) + { + error ("pinv: tol must be greater than zero"); + return retval; + } + + int arg_is_empty = empty_arg ("pinv", arg.rows (), arg.columns ()); + + if (arg_is_empty < 0) + return retval; + else if (arg_is_empty) + return Matrix (); + + if (arg.is_real_type ()) + { + Matrix m = arg.matrix_value (); + + if (! error_state) + retval = m.pseudo_inverse (tol); + } + else if (arg.is_complex_type ()) + { + ComplexMatrix m = arg.complex_matrix_value (); + + if (! error_state) + retval = m.pseudo_inverse (tol); + } + else + { + gripe_wrong_type_arg ("pinv", arg); + } + + return retval; +} + +/* +;;; Local Variables: *** +;;; mode: C++ *** +;;; page-delimiter: "^/\\*" *** +;;; End: *** +*/