Mercurial > octave-nkf
diff src/DLD-FUNCTIONS/inv.cc @ 2928:295f037b4b3e
[project @ 1997-05-05 05:32:33 by jwe]
author | jwe |
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date | Mon, 05 May 1997 05:33:54 +0000 |
parents | |
children | 38de16594cb4 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/DLD-FUNCTIONS/inv.cc Mon May 05 05:33:54 1997 +0000 @@ -0,0 +1,119 @@ +/* + +Copyright (C) 1996, 1997 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +*/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "defun-dld.h" +#include "error.h" +#include "gripes.h" +#include "help.h" +#include "oct-obj.h" +#include "utils.h" + +DEFUN_DLD (inv, args, , + "inv (X): inverse of a square matrix") +{ + octave_value_list retval; + + int nargin = args.length (); + + if (nargin != 1) + { + print_usage ("inv"); + return retval; + } + + octave_value arg = args(0); + + int nr = arg.rows (); + int nc = arg.columns (); + + int arg_is_empty = empty_arg ("inverse", nr, nc); + + if (arg_is_empty < 0) + return retval; + else if (arg_is_empty > 0) + return Matrix (); + + if (nr != nc) + { + gripe_square_matrix_required ("inverse"); + return retval; + } + + if (arg.is_real_type ()) + { + Matrix m = arg.matrix_value (); + + if (! error_state) + { + int info; + double rcond = 0.0; + + retval = m.inverse (info, rcond, 1); + + if (info == -1) + warning ("inverse: matrix singular to machine precision,\ + rcond = %g", rcond); + } + } + else if (arg.is_complex_type ()) + { + ComplexMatrix m = arg.complex_matrix_value (); + + if (! error_state) + { + int info; + double rcond = 0.0; + + retval = m.inverse (info, rcond, 1); + + if (info == -1) + warning ("inverse: matrix singular to machine precision,\ + rcond = %g", rcond); + } + } + else + { + gripe_wrong_type_arg ("inv", arg); + } + + return retval; +} + +// XXX FIXME XXX -- this should really be done with an alias, but +// alias_builtin() won't do the right thing if we are actually using +// dynamic linking. + +DEFUN_DLD (inverse, args, nargout, + "inverse (X): inverse of a square matrix") +{ + return Finv (args, nargout); +} + +/* +;;; Local Variables: *** +;;; mode: C++ *** +;;; End: *** +*/