/* matrix/oper_source.c

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough

 * 

 * 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 3 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 */

int 

FUNCTION(gsl_matrix, add) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)

{

  const size_t M = a->size1;

  const size_t N = a->size2;

  if (b->size1 != M || b->size2 != N)

    {

      GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);

    }

  else 

    {

      const size_t tda_a = a->tda;

      const size_t tda_b = b->tda;

      size_t i, j;

      for (i = 0; i < M; i++)

        {

          for (j = 0; j < N; j++)

            {

              a->data[i * tda_a + j] += b->data[i * tda_b + j];

            }

        }

      return GSL_SUCCESS;

    }

}

int 

FUNCTION(gsl_matrix, sub) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)

{

  const size_t M = a->size1;

  const size_t N = a->size2;

  if (b->size1 != M || b->size2 != N)

    {

      GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);

    }

  else 

    {

      const size_t tda_a = a->tda;

      const size_t tda_b = b->tda;

      size_t i, j;

      for (i = 0; i < M; i++)

        {

          for (j = 0; j < N; j++)

            {

              a->data[i * tda_a + j] -= b->data[i * tda_b + j];

            }

        }

      return GSL_SUCCESS;

    }

}

int 

FUNCTION(gsl_matrix, mul_elements) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)

{

  const size_t M = a->size1;

  const size_t N = a->size2;

  if (b->size1 != M || b->size2 != N)

    {

      GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);

    }

  else 

    {

      const size_t tda_a = a->tda;

      const size_t tda_b = b->tda;

      size_t i, j;

      for (i = 0; i < M; i++)

        {

          for (j = 0; j < N; j++)

            {

              a->data[i * tda_a + j] *= b->data[i * tda_b + j];

            }

        }

      return GSL_SUCCESS;

    }

}

int 

FUNCTION(gsl_matrix, div_elements) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)

{

  const size_t M = a->size1;

  const size_t N = a->size2;

  if (b->size1 != M || b->size2 != N)

    {

      GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);

    }

  else 

    {

      const size_t tda_a = a->tda;

      const size_t tda_b = b->tda;

      size_t i, j;

      for (i = 0; i < M; i++)

        {

          for (j = 0; j < N; j++)

            {

              a->data[i * tda_a + j] /= b->data[i * tda_b + j];

            }

        }

      return GSL_SUCCESS;

    }

}

int 

FUNCTION(gsl_matrix, scale) (TYPE(gsl_matrix) * a, const double x)

{

  const size_t M = a->size1;

  const size_t N = a->size2;

  const size_t tda = a->tda;

  size_t i, j;

  for (i = 0; i < M; i++)

    {

      for (j = 0; j < N; j++)

        {

          a->data[i * tda + j] *= x;

        }

    }

  return GSL_SUCCESS;

}

int 

FUNCTION(gsl_matrix, add_constant) (TYPE(gsl_matrix) * a, const double x)

{

  const size_t M = a->size1;

  const size_t N = a->size2;

  const size_t tda = a->tda;

  size_t i, j;

  for (i = 0; i < M; i++)

    {

      for (j = 0; j < N; j++)

        {

          a->data[i * tda + j] += x;

        }

    }

  return GSL_SUCCESS;

}

int 

FUNCTION(gsl_matrix, add_diagonal) (TYPE(gsl_matrix) * a, const double x)

{

  const size_t M = a->size1;

  const size_t N = a->size2;

  const size_t tda = a->tda;

  const size_t loop_lim = ( M < N ? M : N );

  size_t i;

  for (i = 0; i < loop_lim; i++)

  {

    a->data[i * tda + i] += x;

  }

  return GSL_SUCCESS;

}