new file mode 100644
--- /dev/null
+++ b/liboctave/dbleSCHUR.cc
@@ -0,0 +1,152 @@
+//                                        -*- C++ -*-
+/*
+
+Copyright (C) 1992, 1993, 1994 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 HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#if defined (__GNUG__)
+#pragma implementation
+#endif
+
+#include "dbleSCHUR.h"
+#include "mx-inlines.cc"
+#include "lo-error.h"
+#include "f77-uscore.h"
+
+extern "C"
+{
+  int F77_FCN (dgeesx) (const char*, const char*,
+			int (*)(double*, double*), const char*,
+			const int*, double*, const int*, int*, double*,
+			double*, double*, const int*, double*, double*, 
+			double*, const int*, int*, const int*, int*,
+			int*, long, long);
+}
+
+static int
+select_ana (double *a, double *b)
+{
+   return (*a < 0.0);
+}
+
+static int
+select_dig (double *a, double *b)
+{
+  return (hypot (*a, *b) < 1.0);
+}
+
+int
+SCHUR::init (const Matrix& a, const char *ord)
+{
+  int a_nr = a.rows ();
+  int a_nc = a.cols ();
+  if (a_nr != a_nc)
+    {
+      (*current_liboctave_error_handler) ("SCHUR requires square matrix");
+      return -1;
+    }
+
+  char jobvs = 'V';
+  char sort;
+
+  if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd')
+    sort = 'S';
+  else
+    sort = 'N';
+
+  char sense = 'N';
+
+  int n = a_nc;
+  int lwork = 8 * n;
+  int liwork = 1;
+  int info;
+  int sdim;
+  double rconde;
+  double rcondv;
+
+  double *s = dup (a.data (), a.length ());
+
+  double *wr = new double [n];
+  double *wi = new double [n];
+  double *q = new double [n*n];
+  double *work = new double [lwork];
+
+// These are not referenced for the non-ordered Schur routine.
+
+  int *iwork = (int *) NULL;
+  int *bwork = (int *) NULL;
+  if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd')
+    {
+      iwork = new int [liwork];
+      bwork = new int [n];
+    }
+
+  if (*ord == 'A' || *ord == 'a')
+    {
+      F77_FCN (dgeesx) (&jobvs, &sort, select_ana, &sense, &n, s, &n,
+			&sdim, wr, wi, q, &n, &rconde, &rcondv, work,
+			&lwork, iwork, &liwork, bwork, &info, 1L, 1L);
+    }
+  else if (*ord == 'D' || *ord == 'd')
+    {
+      F77_FCN (dgeesx) (&jobvs, &sort, select_dig, &sense, &n, s, &n,
+			&sdim, wr, wi, q, &n, &rconde, &rcondv, work,
+			&lwork, iwork, &liwork, bwork, &info, 1L, 1L);
+      
+    }
+  else
+    {
+      F77_FCN (dgeesx) (&jobvs, &sort, (void *) 0, &sense, &n, s,
+			&n, &sdim, wr, wi, q, &n, &rconde, &rcondv,
+			work, &lwork, iwork, &liwork, bwork, &info,
+			1L, 1L);
+    }
+
+  schur_mat = Matrix (s, n, n);
+  unitary_mat = Matrix (q, n, n);
+
+  delete [] wr;
+  delete [] wi;
+  delete [] work;
+  delete [] iwork;
+  delete [] bwork;
+
+  return info;
+}
+
+ostream&
+operator << (ostream& os, const SCHUR& a)
+{
+  os << a.schur_matrix () << "\n";
+  os << a.unitary_matrix () << "\n";
+
+  return os;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/