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/*
Copyright (C) 2022 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "gr.h"
#include "gr_mat.h"
int
gr_mat_swap_cols(gr_mat_t mat, slong * perm, slong r, slong s, gr_ctx_t ctx)
{
if (r < 0 || r >= mat->c || s < 0 || s >= mat->c)
return GR_DOMAIN;
_gr_mat_swap_cols(mat, perm, r, s, ctx);
return GR_SUCCESS;
}
void
_gr_mat_swap_cols(gr_mat_t mat, slong * perm, slong r, slong s, gr_ctx_t ctx)
{
if (r != s && gr_mat_is_empty(mat, ctx) == T_FALSE)
{
slong t;
slong sz = ctx->sizeof_elem;
if (perm != NULL)
FLINT_SWAP(slong, perm[r], perm[s]);
for (t = 0; t < mat->r; t++)
gr_swap(GR_MAT_ENTRY(mat, t, r, sz), GR_MAT_ENTRY(mat, t, s, sz), ctx);
}
}