--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/DLD-FUNCTIONS/fft.cc	Mon May 05 05:33:54 1997 +0000
@@ -0,0 +1,120 @@
+/*
+
+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 "lo-mappers.h"
+
+#include "defun-dld.h"
+#include "error.h"
+#include "gripes.h"
+#include "help.h"
+#include "oct-obj.h"
+#include "utils.h"
+
+// This function should be merged with Fifft.
+
+DEFUN_DLD (fft, args, ,
+  "fft (X [, N]): fast fourier transform of a vector")
+{
+  octave_value_list retval;
+
+  int nargin = args.length ();
+
+  if (nargin < 1 || nargin > 2)
+    {
+      print_usage ("fft");
+      return retval;
+    }
+
+  octave_value arg = args(0);
+
+  int n_points = arg.rows ();
+  if (n_points == 1)
+    n_points = arg.columns ();
+
+  if (nargin == 2)
+    {
+      double dval = args(1).double_value ();
+      if (xisnan (dval))
+	error ("fft: NaN is invalid as the N_POINTS");
+      else
+	n_points = NINT (dval);
+    }
+
+  if (error_state)
+    return retval;
+
+  if (n_points < 0)
+    {
+      error ("fft: number of points must be greater than zero");
+      return retval;
+    }
+
+  int arg_is_empty = empty_arg ("fft", arg.rows (), arg.columns ());
+
+  if (arg_is_empty < 0)
+    return retval;
+  else if (arg_is_empty || n_points == 0)
+    return Matrix ();
+
+  if (arg.is_real_type ())
+    {
+      Matrix m = arg.matrix_value ();
+
+      if (! error_state)
+	{
+	  if (m.rows () == 1)
+	    m.resize (1, n_points, 0.0);
+	  else
+	    m.resize (n_points, m.columns (), 0.0);
+	  retval = m.fourier ();
+	}
+    }
+  else if (arg.is_complex_type ())
+    {
+      ComplexMatrix m = arg.complex_matrix_value ();
+
+      if (! error_state)
+	{
+	  if (m.rows () == 1)
+	    m.resize (1, n_points, 0.0);
+	  else
+	    m.resize (n_points, m.columns (), 0.0);
+	  retval = m.fourier ();
+	}
+    }
+  else
+    {
+      gripe_wrong_type_arg ("fft", arg);
+    }
+
+  return retval;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/