/* vector/swap_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.
*/
int FUNCTION(gsl_vector, swap) (TYPE(gsl_vector) * v, TYPE(gsl_vector) * w) {
ATOMIC *d1 = v->data;
ATOMIC *d2 = w->data;
const size_t size = v->size;
const size_t s1 = MULTIPLICITY * v->stride;
const size_t s2 = MULTIPLICITY * w->stride;
size_t i, k;
if (v->size != w->size) {
GSL_ERROR("vector lengths must be equal", GSL_EINVAL);
}
for (i = 0; i < size; i++) {
for (k = 0; k < MULTIPLICITY; k++) {
ATOMIC tmp = d1[i * s1 + k];
d1[i * s1 + k] = d2[i * s2 + k];
d2[i * s2 + k] = tmp;
}
}
return GSL_SUCCESS;
}
int
FUNCTION(gsl_vector, swap_elements) (TYPE(gsl_vector) * v, const size_t i,
const size_t j) {
ATOMIC *data = v->data;
const size_t size = v->size;
const size_t stride = v->stride;
if (i >= size) {
GSL_ERROR("first index is out of range", GSL_EINVAL);
}
if (j >= size) {
GSL_ERROR("second index is out of range", GSL_EINVAL);
}
if (i != j) {
const size_t s = MULTIPLICITY * stride;
size_t k;
for (k = 0; k < MULTIPLICITY; k++) {
ATOMIC tmp = data[j * s + k];
data[j * s + k] = data[i * s + k];
data[i * s + k] = tmp;
}
}
return GSL_SUCCESS;
}
int FUNCTION(gsl_vector, reverse) (TYPE(gsl_vector) * v) {
ATOMIC *data = v->data;
const size_t size = v->size;
const size_t stride = v->stride;
const size_t s = MULTIPLICITY * stride;
size_t i;
for (i = 0; i < (size / 2); i++) {
size_t j = size - i - 1;
size_t k;
for (k = 0; k < MULTIPLICITY; k++) {
ATOMIC tmp = data[j * s + k];
data[j * s + k] = data[i * s + k];
data[i * s + k] = tmp;
}
}
return GSL_SUCCESS;
}