new file mode 100644
--- /dev/null
+++ b/liboctave/floatSCHUR.cc
@@ -0,0 +1,156 @@
+/*
+
+Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2003, 2004,
+              2005, 2007 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 3 of the License, 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, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <iostream>
+
+#include "floatSCHUR.h"
+#include "f77-fcn.h"
+#include "lo-error.h"
+
+extern "C"
+{
+  F77_RET_T
+  F77_FUNC (sgeesx, SGEESX) (F77_CONST_CHAR_ARG_DECL,
+			     F77_CONST_CHAR_ARG_DECL,
+			     FloatSCHUR::select_function,
+			     F77_CONST_CHAR_ARG_DECL,
+			     const octave_idx_type&, float*, const octave_idx_type&, octave_idx_type&,
+			     float*, float*, float*, const octave_idx_type&,
+			     float&, float&, float*, const octave_idx_type&,
+			     octave_idx_type*, const octave_idx_type&, octave_idx_type*, octave_idx_type&
+			     F77_CHAR_ARG_LEN_DECL
+			     F77_CHAR_ARG_LEN_DECL
+			     F77_CHAR_ARG_LEN_DECL);
+}
+
+static octave_idx_type
+select_ana (const float& a, const float&)
+{
+   return (a < 0.0);
+}
+
+static octave_idx_type
+select_dig (const float& a, const float& b)
+{
+  return (hypot (a, b) < 1.0);
+}
+
+octave_idx_type
+FloatSCHUR::init (const FloatMatrix& a, const std::string& ord, bool calc_unitary)
+{
+  octave_idx_type a_nr = a.rows ();
+  octave_idx_type a_nc = a.cols ();
+
+  if (a_nr != a_nc)
+    {
+      (*current_liboctave_error_handler) ("FloatSCHUR requires square matrix");
+      return -1;
+    }
+
+  // Workspace requirements may need to be fixed if any of the
+  // following change.
+
+  char jobvs;
+  char sense = 'N';
+  char sort = 'N';
+
+  if (calc_unitary)
+    jobvs = 'V';
+  else
+    jobvs = 'N';
+
+  char ord_char = ord.empty () ? 'U' : ord[0];
+
+  if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd')
+    sort = 'S';
+
+  if (ord_char == 'A' || ord_char == 'a')
+    selector = select_ana;
+  else if (ord_char == 'D' || ord_char == 'd')
+    selector = select_dig;
+  else
+    selector = 0;
+
+  octave_idx_type n = a_nc;
+  octave_idx_type lwork = 8 * n;
+  octave_idx_type liwork = 1;
+  octave_idx_type info;
+  octave_idx_type sdim;
+  float rconde;
+  float rcondv;
+
+  schur_mat = a;
+
+  if (calc_unitary)
+    unitary_mat.resize (n, n);
+
+  float *s = schur_mat.fortran_vec ();
+  float *q = unitary_mat.fortran_vec ();
+
+  Array<float> wr (n);
+  float *pwr = wr.fortran_vec ();
+
+  Array<float> wi (n);
+  float *pwi = wi.fortran_vec ();
+
+  Array<float> work (lwork);
+  float *pwork = work.fortran_vec ();
+
+  // BWORK is not referenced for the non-ordered Schur routine.
+  Array<octave_idx_type> bwork ((ord_char == 'N' || ord_char == 'n') ? 0 : n);
+  octave_idx_type *pbwork = bwork.fortran_vec ();
+
+  Array<octave_idx_type> iwork (liwork);
+  octave_idx_type *piwork = iwork.fortran_vec ();
+
+  F77_XFCN (sgeesx, SGEESX, (F77_CONST_CHAR_ARG2 (&jobvs, 1),
+			     F77_CONST_CHAR_ARG2 (&sort, 1),
+			     selector,
+			     F77_CONST_CHAR_ARG2 (&sense, 1),
+			     n, s, n, sdim, pwr, pwi, q, n, rconde, rcondv,
+			     pwork, lwork, piwork, liwork, pbwork, info
+			     F77_CHAR_ARG_LEN (1)
+			     F77_CHAR_ARG_LEN (1)
+			     F77_CHAR_ARG_LEN (1)));
+
+  return info;
+}
+
+std::ostream&
+operator << (std::ostream& os, const FloatSCHUR& a)
+{
+  os << a.schur_matrix () << "\n";
+  os << a.unitary_matrix () << "\n";
+
+  return os;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/