new file mode 100644
--- /dev/null
+++ b/src/colloc.cc
@@ -0,0 +1,129 @@
+// tc-colloc.cc                                           -*- C++ -*-
+/*
+
+Copyright (C) 1993 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifdef __GNUG__
+#pragma implementation
+#endif
+
+#include "CollocWt.h"
+
+#include "tree-const.h"
+#include "error.h"
+#include "utils.h"
+
+#ifdef WITH_DLD
+tree_constant *
+builtin_colloc_2 (tree_constant *args, int nargin, int nargout)
+{
+  return collocation_weights (args, nargin);
+}
+#endif
+
+tree_constant *
+collocation_weights (tree_constant *args, int nargin)
+{
+  tree_constant *retval = NULL_TREE_CONST;
+
+  if (args[1].const_type () != tree_constant_rep::complex_scalar_constant
+      && args[1].const_type () != tree_constant_rep::scalar_constant)
+    {
+      message ("colloc", "first argument must be a scalar");
+      return retval;
+    }
+
+  int ncol = NINT (args[1].double_value ());
+  if (ncol < 0)
+    {
+      message ("colloc", "first argument must be non-negative");
+      return retval;
+    }
+
+  int ntot = ncol;
+  int left = 0;
+  int right = 0;
+
+  for (int i = 2; i < nargin; i++)
+    {
+      if (args[i].is_defined ())
+	{
+	  if (! args[i].is_string_type ())
+	    {
+	      message ("colloc", "expecting string argument");
+	      return retval;
+	    }
+
+	  char *s = args[i].string_value ();
+	  if (s != (char *) NULL
+	      && (((*s == 'R' || *s == 'r') && strlen (s) == 1)
+		  || strcmp (s, "right") == 0))
+	    {
+	      right = 1;
+	    }
+	  else if (s != (char *) NULL
+		   && (((*s == 'L' || *s == 'l') && strlen (s) == 1)
+		       || strcmp (s, "left") == 0))
+	    {
+	      left = 1;
+	    }
+	  else
+	    {
+	      message ("colloc", "unrecognized argument");
+	      return retval;
+	    }
+	}
+      else
+	{
+	  message ("colloc", "unexpected NULL argument");
+	  return retval;
+	}
+    }
+
+  ntot += left + right;
+  if (ntot < 1)
+    message ("colloc", "the total number of roots must be positive");
+  
+  CollocWt wts (ncol, left, right);
+
+  ColumnVector r = wts.roots ();
+  Matrix A = wts.first ();
+  Matrix B = wts.second ();
+  ColumnVector q = wts.quad_weights ();
+
+  retval = new tree_constant [5];
+
+  retval[0] = tree_constant (r);
+  retval[1] = tree_constant (A);
+  retval[2] = tree_constant (B);
+  retval[3] = tree_constant (q);
+  retval[4] = tree_constant ();
+
+  return retval;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/
+