--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/DLD-FUNCTIONS/chol.cc	Mon May 05 05:33:54 1997 +0000
@@ -0,0 +1,103 @@
+/*
+
+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 "CmplxCHOL.h"
+#include "dbleCHOL.h"
+
+#include "defun-dld.h"
+#include "error.h"
+#include "gripes.h"
+#include "help.h"
+#include "oct-obj.h"
+#include "utils.h"
+
+DEFUN_DLD (chol, args, nargout,
+  "R = chol (X): cholesky factorization")
+{
+  octave_value_list retval;
+
+  int nargin = args.length ();
+
+  if (nargin != 1 || nargout > 1)
+    {
+      print_usage ("chol");
+      return retval;
+    }
+
+  octave_value arg = args(0);
+    
+  int nr = arg.rows ();
+  int nc = arg.columns ();
+
+  int arg_is_empty = empty_arg ("chol", nr, nc);
+
+  if (arg_is_empty < 0)
+    return retval;
+  if (arg_is_empty > 0)
+    return Matrix ();
+
+  if (arg.is_real_type ())
+    {
+      Matrix m = arg.matrix_value ();
+
+      if (! error_state)
+	{
+	  int info;
+	  CHOL fact (m, info);
+	  if (info != 0)
+	    error ("chol: matrix not positive definite");
+	  else
+	    retval = fact.chol_matrix ();
+	}
+    }
+  else if (arg.is_complex_type ())
+    {
+      ComplexMatrix m = arg.complex_matrix_value ();
+
+      if (! error_state)
+	{
+	  int info;
+	  ComplexCHOL fact (m, info);
+	  if (info != 0)
+	    error ("chol: matrix not positive definite");
+	  else
+	    retval = fact.chol_matrix ();
+	}
+    }
+  else
+    {
+      gripe_wrong_type_arg ("chol", arg);
+    }
+
+  return retval;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/
+