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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"
truth_t
gr_mat_is_scalar(const gr_mat_t mat, gr_ctx_t ctx)
{
truth_t eq, this_eq;
slong i, ar, ac, sz;
ar = gr_mat_nrows(mat, ctx);
ac = gr_mat_ncols(mat, ctx);
sz = ctx->sizeof_elem;
eq = gr_mat_is_diagonal(mat, ctx);
if (eq != T_FALSE)
{
for (i = 1; i < FLINT_MIN(ar, ac); i++)
{
this_eq = gr_equal(GR_MAT_ENTRY(mat, i, i, sz), GR_MAT_ENTRY(mat, 0, 0, sz), ctx);
if (this_eq == T_FALSE)
return T_FALSE;
if (this_eq == T_UNKNOWN)
eq = T_UNKNOWN;
}
}
return eq;
}