| /* 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; |
| } |
| } |