Mercurial > hg > octave-terminal
changeset 180:de63a156b36e
[project @ 1993-10-23 22:45:17 by jwe]
Initial revision
author | jwe |
---|---|
date | Sat, 23 Oct 1993 22:45:17 +0000 |
parents | a29cd8ae572e |
children | 91ec95436dca |
files | src/chol.cc |
diffstat | 1 files changed, 120 insertions(+), 0 deletions(-) [+] |
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new file mode 100644 --- /dev/null +++ b/src/chol.cc @@ -0,0 +1,120 @@ +// f-chol.cc -*- C++ -*- +/* + +Copyright (C) 1993 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 __GNUG__ +#pragma implementation +#endif + +#include "Matrix.h" + +#include "tree-const.h" +#include "user-prefs.h" +#include "gripes.h" +#include "error.h" +#include "f-chol.h" + +#ifdef WITH_DLD +tree_constant * +builtin_chol_2 (const tree_constant *args, int nargin, int nargout) +{ + return chol (args, nargin, nargout); +} +#endif + +tree_constant * +chol (const tree_constant *a, int nargin, int nargout) +{ + tree_constant *retval = new tree_constant [2]; + + tree_constant tmp = a[1].make_numeric ();; + + int nr = tmp.rows (); + int nc = tmp.columns (); + + if (nr == 0 || nc == 0) + { + int flag = user_pref.propagate_empty_matrices; + if (flag != 0) + { + if (flag < 0) + gripe_empty_arg ("chol", 0); + Matrix m; + retval = new tree_constant [3]; + retval[0] = tree_constant (m); + retval[1] = tree_constant (m); + } + else + gripe_empty_arg ("chol", 1); + + return retval; + } + + switch (tmp.const_type ()) + { + case tree_constant_rep::matrix_constant: + { + Matrix m = tmp.matrix_value (); + int info; + CHOL fact (m, info); + if (info != 0) + error ("chol: matrix not positive definite"); + else + retval[0] = tree_constant (fact.chol_matrix ()); + } + break; + case tree_constant_rep::complex_matrix_constant: + { + ComplexMatrix m = tmp.complex_matrix_value (); + int info; + ComplexCHOL fact (m, info); + if (info != 0) + error ("chol: matrix not positive definite"); + else + retval[0] = tree_constant (fact.chol_matrix ()); + } + break; + case tree_constant_rep::scalar_constant: + { + double d = tmp.double_value (); + retval[0] = tree_constant (d); + } + break; + case tree_constant_rep::complex_scalar_constant: + { + Complex c = tmp.complex_value (); + retval[0] = tree_constant (c); + } + break; + default: + break; + } + return retval; +} + +/* +;;; Local Variables: *** +;;; mode: C++ *** +;;; page-delimiter: "^/\\*" *** +;;; End: *** +*/ +