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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 "fmpz_mat.h"
#include "gr_mat.h"
/* todo: could reimplement the generic construction here, for
reduced memory usage in small rings.
todo: could wrap/reimplement fmpz_mat_is_hadamard */
int
gr_mat_hadamard(gr_mat_t mat, gr_ctx_t ctx)
{
slong n;
int status = GR_SUCCESS;
fmpz_mat_t tmp;
n = mat->r;
if (n != mat->c)
return GR_DOMAIN;
if (n <= 1)
return gr_mat_one(mat, ctx);
if (n > 2 && n % 4 != 0)
return GR_DOMAIN;
fmpz_mat_init(tmp, n, n);
status = fmpz_mat_hadamard(tmp) ? GR_SUCCESS : GR_UNABLE;
if (status == GR_SUCCESS)
status = gr_mat_set_fmpz_mat(mat, tmp, ctx);
fmpz_mat_clear(tmp);
return status;
}