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+++ b/liboctave/EIG.h
@@ -0,0 +1,124 @@
+//                                  -*- 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.
+
+*/
+
+#if !defined (octave_EIG_h)
+#define octave_EIG_h 1
+
+#if defined (__GNUG__)
+#pragma interface
+#endif
+
+class ostream;
+
+#include "dMatrix.h"
+#include "CMatrix.h"
+#include "CColVector.h"
+
+extern "C++" {
+
+class EIG
+{
+friend class Matrix;
+friend class ComplexMatrix;
+
+public:
+
+  EIG (void) {}
+
+  EIG (const Matrix& a);
+  EIG (const Matrix& a, int& info);
+
+  EIG (const ComplexMatrix& a);
+  EIG (const ComplexMatrix& a, int& info);
+
+  EIG (const EIG& a);
+
+  EIG& operator = (const EIG& a);
+
+  ComplexColumnVector eigenvalues (void) const;
+  ComplexMatrix eigenvectors (void) const;
+
+  friend ostream&  operator << (ostream& os, const EIG& a);
+
+private:
+
+  int init (const Matrix& a);
+  int init (const ComplexMatrix& a);
+
+  ComplexColumnVector lambda;
+  ComplexMatrix v;
+};
+
+inline EIG::EIG (const Matrix& a)
+{
+  init (a);
+}
+
+inline EIG::EIG (const Matrix& a, int& info)
+{
+  info = init (a);
+}
+
+inline EIG::EIG (const ComplexMatrix& a)
+{
+  init (a);
+}
+
+inline EIG::EIG (const ComplexMatrix& a, int& info)
+{
+  info = init (a);
+}
+
+inline EIG::EIG (const EIG& a)
+{
+  lambda = a.lambda;
+  v = a.v;
+}
+
+inline EIG& EIG::operator = (const EIG& a)
+{
+  lambda = a.lambda;
+  v = a.v;
+  return *this;
+}
+
+inline ComplexColumnVector EIG::eigenvalues (void) const
+{
+  return lambda;
+}
+
+inline ComplexMatrix EIG::eigenvectors (void) const
+{
+  return v;
+}
+
+} // extern "C++"
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/