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/* vector/subvector_source.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 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 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
QUALIFIED_VIEW(_gsl_vector, view)
FUNCTION(gsl_vector, subvector) (QUALIFIED_TYPE(gsl_vector) * v, size_t offset, size_t n)
{
QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;
if (n == 0)
{
GSL_ERROR_VAL ("vector length n must be positive integer",
GSL_EINVAL, view);
}
if (offset + (n - 1) >= v->size)
{
GSL_ERROR_VAL ("view would extend past end of vector",
GSL_EINVAL, view);
}
{
TYPE(gsl_vector) s = NULL_VECTOR;
s.data = v->data + MULTIPLICITY * v->stride * offset ;
s.size = n;
s.stride = v->stride;
s.block = v->block;
s.owner = 0;
view.vector = s;
return view;
}
}
QUALIFIED_VIEW(_gsl_vector, view)
FUNCTION(gsl_vector, subvector_with_stride) (QUALIFIED_TYPE(gsl_vector) * v, size_t offset, size_t stride, size_t n)
{
QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;
if (n == 0)
{
GSL_ERROR_VAL ("vector length n must be positive integer",
GSL_EINVAL, view);
}
if (stride == 0)
{
GSL_ERROR_VAL ("stride must be positive integer",
GSL_EINVAL, view);
}
if (offset + (n - 1) * stride >= v->size)
{
GSL_ERROR_VAL ("view would extend past end of vector",
GSL_EINVAL, view);
}
{
TYPE(gsl_vector) s = NULL_VECTOR;
s.data = v->data + MULTIPLICITY * v->stride * offset ;
s.size = n;
s.stride = v->stride * stride;
s.block = v->block;
s.owner = 0;
view.vector = s;
return view;
}
}
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