new file mode 100644
--- /dev/null
+++ b/src/OPERATORS/op-m-sm.cc
@@ -0,0 +1,151 @@
+/*
+
+Copyright (C) 2004 David Bateman
+Copyright (C) 1998-2004 Andy Adler
+
+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 this program; 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 "gripes.h"
+#include "oct-obj.h"
+#include "ov.h"
+#include "ov-typeinfo.h"
+#include "ov-re-mat.h"
+#include "ops.h"
+#include "xdiv.h"
+
+#include "sparse-xpow.h"
+#include "sparse-xdiv.h"
+#include "smx-sm-m.h"
+#include "smx-m-sm.h"
+#include "ov-re-sparse.h"
+
+// matrix by sparse matrix ops.
+
+DEFBINOP_OP (add, matrix, sparse_matrix, +)
+DEFBINOP_OP (sub, matrix, sparse_matrix, -)
+
+DEFBINOP (mul, matrix, sparse_matrix)
+{
+  CAST_BINOP_ARGS (const octave_matrix&, const octave_sparse_matrix&);
+  
+  Matrix tmp (v2.matrix_value ());
+
+  return octave_value ( v1.matrix_value() * tmp);
+}
+
+DEFBINOP (div, matrix, sparse_matrix)
+{
+  CAST_BINOP_ARGS (const octave_matrix&, const octave_sparse_matrix&);
+  
+  return xdiv (v1.matrix_value (), v2.sparse_matrix_value ());
+}
+
+DEFBINOPX (pow, matrix, sparse_matrix)
+{
+  error ("can't do A ^ B for A and B both matrices");
+  return octave_value ();
+}
+
+DEFBINOP (ldiv, matrix, sparse_matrix)
+{
+  CAST_BINOP_ARGS (const octave_matrix&, const octave_sparse_matrix&);
+  
+  return xleftdiv (v1.matrix_value (), v2.matrix_value ());
+}
+
+DEFBINOP_FN (lt, matrix, sparse_matrix, mx_el_lt)
+DEFBINOP_FN (le, matrix, sparse_matrix, mx_el_le)
+DEFBINOP_FN (eq, matrix, sparse_matrix, mx_el_eq)
+DEFBINOP_FN (ge, matrix, sparse_matrix, mx_el_ge)
+DEFBINOP_FN (gt, matrix, sparse_matrix, mx_el_gt)
+DEFBINOP_FN (ne, matrix, sparse_matrix, mx_el_ne)
+
+DEFBINOP_FN (el_mul, matrix, sparse_matrix, product)
+DEFBINOP_FN (el_div, matrix, sparse_matrix, quotient)
+
+DEFBINOP (el_pow, matrix, sparse_matrix)
+{
+  CAST_BINOP_ARGS (const octave_matrix&, const octave_sparse_matrix&);
+  
+  return octave_value (elem_xpow (SparseMatrix (v1.matrix_value ()), 
+				  v2.sparse_matrix_value ()));
+}
+
+DEFBINOP (el_ldiv, matrix, sparse_matrix)
+{
+  CAST_BINOP_ARGS (const octave_matrix&, const octave_sparse_matrix&);
+  
+  return octave_value 
+    (quotient (v2.sparse_matrix_value (), v1.matrix_value ()));
+}
+
+DEFBINOP_FN (el_and, matrix, sparse_matrix, mx_el_and)
+DEFBINOP_FN (el_or,  matrix, sparse_matrix, mx_el_or)
+
+DEFCATOP (m_sm, matrix, sparse_matrix)
+{
+  CAST_BINOP_ARGS (octave_matrix&, const octave_sparse_matrix&);
+  SparseMatrix tmp (v1.matrix_value ());
+  return octave_value (tmp. concat (v2.sparse_matrix_value (), ra_idx));
+}
+
+DEFCONV (sparse_matrix_conv, matrix, sparse_matrix)
+{
+  CAST_CONV_ARG (const octave_matrix&);
+  return new octave_sparse_matrix (SparseMatrix (v.matrix_value ()));
+}
+
+void
+install_m_sm_ops (void)
+{
+  INSTALL_BINOP (op_add, octave_matrix, octave_sparse_matrix, add);
+  INSTALL_BINOP (op_sub, octave_matrix, octave_sparse_matrix, sub);
+  INSTALL_BINOP (op_mul, octave_matrix, octave_sparse_matrix, mul);
+  INSTALL_BINOP (op_div, octave_matrix, octave_sparse_matrix, div);
+  INSTALL_BINOP (op_pow, octave_matrix, octave_sparse_matrix, pow);
+  INSTALL_BINOP (op_ldiv, octave_matrix, octave_sparse_matrix, ldiv);
+  INSTALL_BINOP (op_lt, octave_matrix, octave_sparse_matrix, lt);
+  INSTALL_BINOP (op_le, octave_matrix, octave_sparse_matrix, le);
+  INSTALL_BINOP (op_eq, octave_matrix, octave_sparse_matrix, eq);
+  INSTALL_BINOP (op_ge, octave_matrix, octave_sparse_matrix, ge);
+  INSTALL_BINOP (op_gt, octave_matrix, octave_sparse_matrix, gt);
+  INSTALL_BINOP (op_ne, octave_matrix, octave_sparse_matrix, ne);
+  INSTALL_BINOP (op_el_mul, octave_matrix, octave_sparse_matrix, el_mul);
+  INSTALL_BINOP (op_el_div, octave_matrix, octave_sparse_matrix, el_div);
+  INSTALL_BINOP (op_el_pow, octave_matrix, octave_sparse_matrix, el_pow);
+  INSTALL_BINOP (op_el_ldiv, octave_matrix, octave_sparse_matrix, el_ldiv);
+  INSTALL_BINOP (op_el_and, octave_matrix, octave_sparse_matrix, el_and);
+  INSTALL_BINOP (op_el_or, octave_matrix, octave_sparse_matrix,  el_or);
+
+  INSTALL_CATOP (octave_matrix, octave_sparse_matrix, m_sm);
+
+  INSTALL_ASSIGNCONV (octave_matrix, octave_sparse_matrix, 
+		      octave_sparse_matrix);
+
+  INSTALL_WIDENOP (octave_matrix, octave_sparse_matrix, 
+		   sparse_matrix_conv);
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/