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CmplxAEPBAL.cc
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1996-09-28
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// -*- C++ -*-
/*
Copyright (C) 1992, 1993, 1994, 1995 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
#include "CmplxAEPBAL.h"
#include "dMatrix.h"
#include "f77-uscore.h"
extern "C"
{
int F77_FCN (zgebal) (const char*, const int*, Complex*, const int*,
int*, int*, double*, int*, long, long);
int F77_FCN (zgebak) (const char*, const char*, const int*, const int*,
const int*, double*, const int*, Complex*,
const int*, int*, long, long);
}
int
ComplexAEPBALANCE::init (const ComplexMatrix& a, const char *balance_job)
{
int n = a.cols ();
// Parameters for balance call.
int info;
int ilo;
int ihi;
double *scale = new double [n];
// Copy matrix into local structure.
balanced_mat = a;
F77_FCN (zgebal) (balance_job, &n, balanced_mat.fortran_vec (),
&n, &ilo, &ihi, scale, &info, 1L, 1L);
// Initialize balancing matrix to identity.
balancing_mat = Matrix (n, n, 0.0);
for (int i = 0; i < n; i++)
balancing_mat (i, i) = 1.0;
F77_FCN (zgebak) (balance_job, "R", &n, &ilo, &ihi, scale, &n,
balancing_mat.fortran_vec (), &n, &info, 1L, 1L);
delete [] scale;
return info;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/