new file mode 100644
--- /dev/null
+++ b/src/ov-mapper.cc
@@ -0,0 +1,257 @@
+/*
+
+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__)
+#pragma implementation
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "error.h"
+#include "gripes.h"
+#include "oct-obj.h"
+#include "ov-mapper.h"
+#include "ov.h"
+
+octave_allocator
+octave_mapper::allocator (sizeof (octave_mapper));
+
+int
+octave_mapper::t_id (-1);
+
+const string
+octave_mapper::t_name ("built-in mapper function");
+
+static bool
+any_element_less_than (const Matrix& a, double val)
+{
+  int nr = a.rows ();
+  int nc = a.columns ();
+
+  for (int j = 0; j < nc; j++)
+    for (int i = 0; i < nr; i++)
+      if (a (i, j) < val)
+	return true;
+
+  return false;
+}
+
+static bool
+any_element_greater_than (const Matrix& a, double val)
+{
+  int nr = a.rows ();
+  int nc = a.columns ();
+
+  for (int j = 0; j < nc; j++)
+    for (int i = 0; i < nr; i++)
+      if (a (i, j) > val)
+	return true;
+
+  return false;
+}
+
+octave_value
+octave_mapper::apply (const octave_value& arg) const
+{
+  octave_value retval;
+
+  if (ch_map_fcn)
+    {
+      // XXX FIXME XXX -- this could be done in a better way...
+
+      octave_value tmp = arg.convert_to_str ();
+
+      if (! error_state)
+	{
+	  charMatrix chm = tmp.char_matrix_value ();
+
+	  if (! error_state)
+	    {
+	      int nr = chm.rows ();
+	      int nc = chm.cols ();
+
+	      switch (flag)
+		{
+		case 0:
+		  {
+		    Matrix result (nr, nc);
+
+		    // islapha and friends can return any nonzero value
+		    // to mean true, but we want to return 1 or 0 only.
+
+		    for (int j = 0; j < nc; j++)
+		      for (int i = 0; i < nr; i++)
+			result (i, j) = ch_map_fcn (chm (i, j)) ? 1 : 0;
+
+		    retval = result;
+		  }
+		  break;
+
+		case 1:
+		  {
+		    Matrix result (nr, nc);
+
+		    for (int j = 0; j < nc; j++)
+		      for (int i = 0; i < nr; i++)
+			result (i, j) = ch_map_fcn (chm (i, j));
+
+		    retval = result;
+		  }
+		  break;
+
+		case 2:
+		  {
+		    charMatrix result (nr, nc);
+
+		    for (int j = 0; j < nc; j++)
+		      for (int i = 0; i < nr; i++)
+			result (i, j) = ch_map_fcn (chm (i, j));
+
+		    retval = octave_value (result, true);
+		  }
+		  break;
+
+		default:
+		  panic_impossible ();
+		  break;
+		}
+	    }
+	}
+    }
+  else
+    {
+      if (arg.is_real_type ())
+	{
+	  if (arg.is_scalar_type ())
+	    {
+	      double d = arg.double_value ();
+
+	      if (flag && (d < lower_limit || d > upper_limit))
+		{
+		  if (c_c_map_fcn)
+		    retval = c_c_map_fcn (Complex (d));
+		  else
+		    error ("%s: unable to handle real arguments",
+			   name().c_str ());
+		}
+	      else if (d_d_map_fcn)
+		retval = d_d_map_fcn (d);
+	      else
+		error ("%s: unable to handle real arguments",
+		       name().c_str ());
+	    }
+	  else
+	    {
+	      Matrix m = arg.matrix_value ();
+
+	      if (error_state)
+		return retval;
+
+	      if (flag
+		  && (any_element_less_than (m, lower_limit)
+		      || any_element_greater_than (m, upper_limit)))
+		{
+		  if (c_c_map_fcn)
+		    {
+		      ComplexMatrix cm (m);
+		      retval = cm.map (c_c_map_fcn);
+		    }
+		  else
+		    error ("%s: unable to handle real arguments",
+			   name().c_str ());
+		}
+	      else if (d_d_map_fcn)
+		retval = m.map (d_d_map_fcn);
+	      else
+		error ("%s: unable to handle real arguments",
+		       name().c_str ());
+	    }
+	}
+      else if (arg.is_complex_type ())
+	{
+	  if (arg.is_scalar_type ())
+	    {
+	      Complex c = arg.complex_value ();
+
+	      if (d_c_map_fcn)
+		retval = d_c_map_fcn (c);
+	      else if (c_c_map_fcn)
+		retval = c_c_map_fcn (c);
+	      else
+		error ("%s: unable to handle complex arguments",
+		       name().c_str ());
+	    }
+	  else
+	    {
+	      ComplexMatrix cm = arg.complex_matrix_value ();
+
+	      if (error_state)
+		return retval;
+
+	      if (d_c_map_fcn)
+		retval = cm.map (d_c_map_fcn);
+	      else if (c_c_map_fcn)
+		retval = cm.map (c_c_map_fcn);
+	      else
+		error ("%s: unable to handle complex arguments",
+		       name().c_str ());
+	    }
+	}
+      else
+	gripe_wrong_type_arg ("mapper", arg);
+    }
+
+  return retval;
+}
+
+octave_value_list
+octave_mapper::do_index_op (int, const octave_value_list& args)
+{
+  octave_value retval;
+
+  if (error_state)
+    return retval;
+
+  int nargin = args.length ();
+
+  if (nargin > 1)
+    ::error ("%s: too many arguments", name().c_str ());
+  else if (nargin < 1)
+    ::error ("%s: too few arguments", name().c_str ());
+  else
+    {
+      if (args(0).is_defined ())
+	retval = apply (args(0));
+      else
+	::error ("%s: argument undefined", name().c_str ());
+    }
+
+  return retval;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/