--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/DLD-FUNCTIONS/givens.cc	Mon May 05 05:33:54 1997 +0000
@@ -0,0 +1,122 @@
+/*
+
+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.
+
+*/
+
+// Originally written by A. S. Hodel <scotte@eng.auburn.edu>
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "defun-dld.h"
+#include "error.h"
+#include "help.h"
+#include "oct-obj.h"
+
+DEFUN_DLD (givens, args, nargout,
+  "G = givens (X, Y)\n\
+\n\
+compute orthogonal matrix G = [c s; -conj (s) c]\n\
+such that G [x; y] = [*; 0]  (x, y scalars)\n\
+\n\
+[c, s] = givens (x, y) returns the (c, s) values themselves.")
+{
+  octave_value_list retval;
+
+  int nargin = args.length ();
+
+  if (nargin != 2 || nargout > 2)
+    {
+      print_usage ("givens");
+      return retval;
+    }
+  else
+    {
+      if (args(0).is_complex_type () || args(1).is_complex_type ())
+	{
+	  Complex cx = args(0).complex_value ();
+	  Complex cy = args(1).complex_value ();
+
+	  if (! error_state)
+	    {
+	      ComplexMatrix result = Givens (cx, cy);
+
+	      if (! error_state)
+		{
+		  switch (nargout)
+		    {
+		    case 0:
+		    case 1:
+		      retval(0) = result;
+		      break;
+   
+		    case 2:
+		      retval(1) = result (0, 1);
+		      retval(0) = result (0, 0);
+		      break;
+
+		    default:
+		      error ("givens: invalid number of output arguments");
+		      break;
+		    }
+		}
+	    }
+	}
+      else
+	{
+	  double x = args(0).double_value ();
+	  double y = args(1).double_value ();
+
+	  if (! error_state)
+	    {
+	      Matrix result = Givens (x, y);
+
+	      if (! error_state)
+		{
+		  switch (nargout)
+		    {
+		    case 0:
+		    case 1:
+		      retval(0) = result;
+		      break;
+   
+		    case 2:
+		      retval(1) = result (0, 1);
+		      retval(0) = result (0, 0);
+		      break;
+
+		    default:
+		      error ("givens: invalid number of output arguments");
+		      break;
+		    }
+		}
+	    }
+	}
+    }
+
+  return retval;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/