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+/*
+
+Copyright (C) 2008 Jaroslav Hajek
+
+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/>.
+
+*/
+
+#if !defined (octave_base_aepbal_h)
+#define octave_base_aepbal_h 1
+
+#include "oct-types.h"
+
+template <class MatrixT, class VectorT>
+class base_aepbal
+{
+protected:
+  MatrixT balanced_mat;
+  VectorT scale;
+  octave_idx_type ilo, ihi;
+  char job;
+  base_aepbal (void) : balanced_mat (), scale (), ilo (), ihi (), job () { }
+
+public:
+
+  base_aepbal (const base_aepbal& a) 
+    : balanced_mat (a.balanced_mat), scale (a.scale), 
+      ilo(a.ilo), ihi(a.ihi), job(a.job)
+  { 
+  }
+
+  base_aepbal& operator = (const base_aepbal& a)
+    {
+      balanced_mat = a.balanced_mat;
+      scale = a.scale;
+      ilo = a.ilo;
+      ihi = a.ihi;
+      job = a.job;
+    }
+
+  MatrixT balanced_matrix (void) const { return balanced_mat; }
+
+  VectorT permuting_vector (void) const
+    {
+      octave_idx_type n = balanced_mat.rows ();
+      VectorT pv (n);
+      for (octave_idx_type i = 0; i < n; i++)
+        pv(i) = i+1;
+      for (octave_idx_type i = n-1; i >= ihi; i--)
+        {
+          octave_idx_type j = scale(i) - 1;
+          octave_idx_type k = pv(j);
+          pv(j) = pv(i);
+          pv(i) = k;
+        }
+      for (octave_idx_type i = ilo-2; i >= 0; i--)
+        {
+          octave_idx_type j = scale(i) - 1;
+          octave_idx_type k = pv(j);
+          pv(j) = pv(i);
+          pv(i) = k;
+        }
+      
+      return pv;
+    }
+
+  VectorT scaling_vector (void) const
+    {
+      octave_idx_type n = balanced_mat.rows ();
+      VectorT scv (n);
+      for (octave_idx_type i = 0; i < ilo-1; i++)
+        scv(i) = 1;
+      for (octave_idx_type i = ilo-1; i < ihi; i++)
+        scv(i) = scale(i);
+      for (octave_idx_type i = ihi; i < n; i++)
+        scv(i) = 1;
+
+      return scv;
+    }
+};
+
+#endif