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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_transpose(gr_mat_t B, const gr_mat_t A, gr_ctx_t ctx)
{
slong i, j;
slong sz = ctx->sizeof_elem;
int status = GR_SUCCESS;
if (B->r != A->c || B->c != A->r)
return GR_DOMAIN;
if (A->r == 0 || A->c == 0)
return GR_SUCCESS;
if (A == B) /* In-place, guaranteed to be square */
{
for (i = 0; i < A->r - 1; i++)
{
for (j = i + 1; j < A->c; j++)
{
gr_swap(GR_MAT_ENTRY(A, i, j, sz), GR_MAT_ENTRY(A, j, i, sz), ctx);
}
}
}
else /* Not aliased; general case */
{
for (i = 0; i < B->r; i++)
for (j = 0; j < B->c; j++)
status |= gr_set(GR_MAT_ENTRY(B, i, j, sz), GR_MAT_ENTRY(A, j, i, sz), ctx);
}
return status;
}