/* matrix/init_source.c

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007, 2009 Gerard Jungman, 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.

 */

TYPE (gsl_matrix) *

FUNCTION (gsl_matrix, alloc) (const size_t n1, const size_t n2)

{

  TYPE (gsl_block) * block;

  TYPE (gsl_matrix) * m;

  m = (TYPE (gsl_matrix) *) malloc (sizeof (TYPE (gsl_matrix)));

  if (m == 0)

    {

      GSL_ERROR_VAL ("failed to allocate space for matrix struct",

                        GSL_ENOMEM, 0);

    }

  /* FIXME: n1*n2 could overflow for large dimensions */

  block = FUNCTION(gsl_block, alloc) (n1 * n2) ;

  if (block == 0)

    {

      GSL_ERROR_VAL ("failed to allocate space for block",

                        GSL_ENOMEM, 0);

    }

  m->data = block->data;

  m->size1 = n1;

  m->size2 = n2;

  m->tda = n2; 

  m->block = block;

  m->owner = 1;

  return m;

}

TYPE (gsl_matrix) *

FUNCTION (gsl_matrix, calloc) (const size_t n1, const size_t n2)

{

  size_t i;

  TYPE (gsl_matrix) * m = FUNCTION (gsl_matrix, alloc) (n1, n2);

  if (m == 0)

    return 0;

  /* initialize matrix to zero */

  memset(m->data, 0, MULTIPLICITY * n1 * n2 * sizeof(ATOMIC));

  for (i = 0; i < MULTIPLICITY * n1 * n2; i++)

    {

      m->data[i] = 0;

    }

  return m;

}

TYPE (gsl_matrix) *

FUNCTION (gsl_matrix, alloc_from_block) (TYPE(gsl_block) * block, 

                                         const size_t offset,

                                         const size_t n1, 

                                         const size_t n2,

                                         const size_t d2)

{

  TYPE (gsl_matrix) * m;

  if (d2 < n2)

    {

      GSL_ERROR_VAL ("matrix dimension d2 must be greater than n2",

                        GSL_EINVAL, 0);

    }

  else if (block->size < offset + n1 * d2)

    {

      GSL_ERROR_VAL ("matrix size exceeds available block size",

                        GSL_EINVAL, 0);

    }

  m = (TYPE (gsl_matrix) *) malloc (sizeof (TYPE (gsl_matrix)));

  if (m == 0)

    {

      GSL_ERROR_VAL ("failed to allocate space for matrix struct",

                        GSL_ENOMEM, 0);

    }

  m->data = block->data + MULTIPLICITY * offset;

  m->size1 = n1;

  m->size2 = n2;

  m->tda = d2;

  m->block = block;

  m->owner = 0;

  return m;

}

TYPE (gsl_matrix) *

FUNCTION (gsl_matrix, alloc_from_matrix) (TYPE(gsl_matrix) * mm, 

                                          const size_t k1,

                                          const size_t k2,

                                          const size_t n1, 

                                          const size_t n2)

{

  TYPE (gsl_matrix) * m;

  if (k1 + n1 > mm->size1)

    {

      GSL_ERROR_VAL ("submatrix dimension 1 exceeds size of original",

                        GSL_EINVAL, 0);

    }

  else if (k2 + n2 > mm->size2)

    {

      GSL_ERROR_VAL ("submatrix dimension 2 exceeds size of original",

                        GSL_EINVAL, 0);

    }

  m = (TYPE (gsl_matrix) *) malloc (sizeof (TYPE (gsl_matrix)));

  if (m == 0)

    {

      GSL_ERROR_VAL ("failed to allocate space for matrix struct",

                        GSL_ENOMEM, 0);

    }

  m->data = mm->data + k1 * mm->tda + k2 ;

  m->size1 = n1;

  m->size2 = n2;

  m->tda = mm->tda;

  m->block = mm->block;

  m->owner = 0;

  return m;

}

void

FUNCTION (gsl_matrix, free) (TYPE (gsl_matrix) * m)

{

  RETURN_IF_NULL (m);

  if (m->owner)

    {

      FUNCTION(gsl_block, free) (m->block);

    }

  free (m);

}

void

FUNCTION (gsl_matrix, set_identity) (TYPE (gsl_matrix) * m)

{

  size_t i, j;

  ATOMIC * const data = m->data;

  const size_t p = m->size1 ;

  const size_t q = m->size2 ;

  const size_t tda = m->tda ;

  const BASE zero = ZERO;

  const BASE one = ONE;

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

    {

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

        {

          *(BASE *) (data + MULTIPLICITY * (i * tda + j)) = ((i == j) ? one : zero);

        }

    }

}

void

FUNCTION (gsl_matrix, set_zero) (TYPE (gsl_matrix) * m)

{

  size_t i, j;

  ATOMIC * const data = m->data;

  const size_t p = m->size1 ;

  const size_t q = m->size2 ;

  const size_t tda = m->tda ;

  const BASE zero = ZERO;

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

    {

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

        {

          *(BASE *) (data + MULTIPLICITY * (i * tda + j)) = zero;

        }

    }

}

void

FUNCTION (gsl_matrix, set_all) (TYPE (gsl_matrix) * m, BASE x)

{

  size_t i, j;

  ATOMIC * const data = m->data;

  const size_t p = m->size1 ;

  const size_t q = m->size2 ;

  const size_t tda = m->tda ;

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

    {

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

        {

          *(BASE *) (data + MULTIPLICITY * (i * tda + j)) = x;

        }

    }

}