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/* vector/swap_source.c
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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int
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FUNCTION (gsl_vector, swap) (TYPE (gsl_vector) * v, TYPE (gsl_vector) * w)
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{
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ATOMIC * d1 = v->data ;
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ATOMIC * d2 = w->data ;
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const size_t size = v->size ;
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const size_t s1 = MULTIPLICITY * v->stride ;
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const size_t s2 = MULTIPLICITY * w->stride ;
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size_t i, k ;
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if (v->size != w->size)
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{
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GSL_ERROR("vector lengths must be equal", GSL_EINVAL);
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}
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for (i = 0; i < size; i++)
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{
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for (k = 0; k < MULTIPLICITY; k++)
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{
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ATOMIC tmp = d1[i*s1 + k];
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d1[i*s1+k] = d2[i*s2 + k];
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d2[i*s2+k] = tmp;
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}
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}
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return GSL_SUCCESS;
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}
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int
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FUNCTION (gsl_vector, swap_elements) (TYPE (gsl_vector) * v, const size_t i, const size_t j)
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{
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ATOMIC * data = v->data ;
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const size_t size = v->size ;
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const size_t stride = v->stride ;
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if (i >= size)
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{
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GSL_ERROR("first index is out of range", GSL_EINVAL);
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}
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if (j >= size)
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{
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GSL_ERROR("second index is out of range", GSL_EINVAL);
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}
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if (i != j)
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{
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const size_t s = MULTIPLICITY * stride ;
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size_t k ;
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for (k = 0; k < MULTIPLICITY; k++)
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{
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ATOMIC tmp = data[j*s + k];
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data[j*s+k] = data[i*s + k];
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data[i*s+k] = tmp;
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}
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}
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return GSL_SUCCESS;
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}
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int
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FUNCTION (gsl_vector, reverse) (TYPE (gsl_vector) * v)
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{
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ATOMIC * data = v->data ;
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const size_t size = v->size ;
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const size_t stride = v->stride ;
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const size_t s = MULTIPLICITY * stride ;
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size_t i ;
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for (i = 0 ; i < (size / 2) ; i++)
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{
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size_t j = size - i - 1 ;
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size_t k;
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for (k = 0; k < MULTIPLICITY; k++)
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{
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ATOMIC tmp = data[j*s + k];
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data[j*s+k] = data[i*s + k];
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data[i*s+k] = tmp;
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}
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}
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return GSL_SUCCESS;
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}
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