/* matrix/rowcol_source.c

 * 

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

 */

QUALIFIED_VIEW(_gsl_vector,view)

FUNCTION (gsl_matrix, row) (QUALIFIED_TYPE(gsl_matrix) * m, const size_t i)

{

  QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;

  if (i >= m->size1)

    {

      GSL_ERROR_VAL ("row index is out of range", GSL_EINVAL, view);

    }

  {

    TYPE(gsl_vector) v = NULL_VECTOR;

    v.data = m->data + i * MULTIPLICITY * m->tda;

    v.size = m->size2;

    v.stride = 1;

    v.block = m->block;

    v.owner = 0;

    view.vector = v;

    return view;

  }

}

QUALIFIED_VIEW(_gsl_vector,view)

FUNCTION (gsl_matrix, column) (QUALIFIED_TYPE(gsl_matrix) * m, const size_t j)

{

  QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;

  if (j >= m->size2)

    {

      GSL_ERROR_VAL ("column index is out of range", GSL_EINVAL, view);

    }

  {

    TYPE(gsl_vector) v = NULL_VECTOR;

    v.data = m->data + j * MULTIPLICITY;

    v.size = m->size1;

    v.stride = m->tda;

    v.block = m->block;

    v.owner = 0;

    view.vector = v;

    return view;

  }

}

QUALIFIED_VIEW(_gsl_vector,view)

FUNCTION (gsl_matrix, diagonal) (QUALIFIED_TYPE(gsl_matrix) * m)

{

  QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;

  TYPE(gsl_vector) v = NULL_VECTOR;

  v.data = m->data;

  v.size = GSL_MIN(m->size1,m->size2);

  v.stride = m->tda + 1;

  v.block = m->block;

  v.owner = 0;

  view.vector = v;

  return view;

}

QUALIFIED_VIEW(_gsl_vector,view)

FUNCTION (gsl_matrix, subdiagonal) (QUALIFIED_TYPE(gsl_matrix) * m,

                                    const size_t k)

{

  QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;

  if (k >= m->size1)

    {

      GSL_ERROR_VAL ("subdiagonal index is out of range", GSL_EINVAL, view);

    }

  {

    TYPE(gsl_vector) v = NULL_VECTOR;

    v.data = m->data + k * MULTIPLICITY * m->tda;

    v.size = GSL_MIN(m->size1 - k, m->size2);

    v.stride = m->tda + 1;

    v.block = m->block;

    v.owner = 0;

    view.vector = v;

    return view;

  }

}

QUALIFIED_VIEW(_gsl_vector,view)

FUNCTION (gsl_matrix, superdiagonal) (QUALIFIED_TYPE(gsl_matrix) * m,

                                      const size_t k)

{

  QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;

  if (k >= m->size2)

    {

      GSL_ERROR_VAL ("column index is out of range", GSL_EINVAL, view);

    }

  {

    TYPE(gsl_vector) v = NULL_VECTOR;

    v.data = m->data + k * MULTIPLICITY;

    v.size = GSL_MIN(m->size1, m->size2 - k);

    v.stride = m->tda + 1;

    v.block = m->block;

    v.owner = 0;

    view.vector = v;

    return view;

  }

}

QUALIFIED_VIEW(_gsl_vector,view)

FUNCTION (gsl_matrix, subrow) (QUALIFIED_TYPE(gsl_matrix) * m, const size_t i, const size_t offset, const size_t n)

{

  QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;

  if (i >= m->size1)

    {

      GSL_ERROR_VAL ("row index is out of range", GSL_EINVAL, view);

    }

  else if (n == 0)

    {

      GSL_ERROR_VAL ("vector length n must be positive integer",

                     GSL_EINVAL, view);

    }

  else if (offset + n > m->size2)

    {

      GSL_ERROR_VAL ("dimension n overflows matrix", GSL_EINVAL, view);

    }

  {

    TYPE(gsl_vector) v = NULL_VECTOR;

    v.data = m->data + MULTIPLICITY * (i * m->tda + offset);

    v.size = n;

    v.stride = 1;

    v.block = m->block;

    v.owner = 0;

    view.vector = v;

    return view;

  }

}

QUALIFIED_VIEW(_gsl_vector,view)

FUNCTION (gsl_matrix, subcolumn) (QUALIFIED_TYPE(gsl_matrix) * m, const size_t j, const size_t offset, const size_t n)

{

  QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;

  if (j >= m->size2)

    {

      GSL_ERROR_VAL ("column index is out of range", GSL_EINVAL, view);

    }

  else if (n == 0)

    {

      GSL_ERROR_VAL ("vector length n must be positive integer",

                     GSL_EINVAL, view);

    }

  else if (offset + n > m->size1)

    {

      GSL_ERROR_VAL ("dimension n overflows matrix", GSL_EINVAL, view);

    }

  {

    TYPE(gsl_vector) v = NULL_VECTOR;

    v.data = m->data + MULTIPLICITY * (offset * m->tda + j);

    v.size = n;

    v.stride = m->tda;

    v.block = m->block;

    v.owner = 0;

    view.vector = v;

    return view;

  }

}