/*
 * This file is part of the ESO SINFONI Pipeline
 * Copyright (C) 2004,2005 European Southern Observatory
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, 51 Franklin St, Fifth Floor, Boston, MA  02111-1307  USA
 */
#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif
#include "sinfo_solve_poly_root.h"

/**@{*/
/**
 * @defgroup sinfo_companion To be removed
 *
 * TBD
 */

/**
 @name sinfo_set_companion_matrix
 @brief TBD
 @param a matrix
 @param nc size
 @param  m matrix
 @return TBD
 */
void
sinfo_set_companion_matrix(const double *a, size_t nc, double *m)
{
    size_t i, j;

    for (i = 0; i < nc; i++)
        for (j = 0; j < nc; j++)
            MAT (m, i, j, nc)= 0.0;

    for (i = 1; i < nc; i++)
        MAT (m, i, i - 1, nc)= 1.0;

    for (i = 0; i < nc; i++)
        MAT (m, i, nc - 1, nc)= -a[i] / a[nc];
    }
    /**@}*/