new file mode 100644
--- /dev/null
+++ b/liboctave/dNDArray.cc
@@ -0,0 +1,84 @@
+//N-D Array  manipulations.
+/*
+
+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.
+
+*/
+
+#if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION)
+#pragma implementation
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "NDArray.h"
+#include "mx-base.h"
+#include "lo-ieee.h"
+
+bool
+NDArray::any_element_is_negative (bool neg_zero) const
+{
+  int n = length (); 
+  if (neg_zero)
+    {
+      for (int i = 0; i < n; i++)
+	if (lo_ieee_signbit (Array<double>::elem (i)))
+	  return true;
+    }
+  else
+    {
+      for (int i = 0; i < n; i++)
+	if (Array<double>::elem (i) < 0)
+	  return true;
+    }
+ 
+ return false;
+}
+
+bool
+NDArray::all_integers (double& max_val, double& min_val) const
+{
+  int n = length ();
+
+  if (n > 0)
+    {
+      max_val = Array<double>::elem (0);
+      min_val = Array<double>::elem (0);
+    }
+  else 
+    return false;
+
+  for (int i = 0; i < n; i++)
+    {
+      double val = Array<double>::elem (0);
+      
+      if (val > max_val)
+	max_val = val;
+
+      if (val < min_val)
+	min_val = val;
+
+      if (D_NINT (val) != val)
+	return false;
+    }
+
+  return true;
+}