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/*
Copyright (C) 2011 Fredrik Johansson
Copyright (C) 2013 Mike Hansen
Copyright (C) 2021 Daniel Schultz
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.h"
#include "fmpz_mod_mat.h"
void fmpz_mod_mat_randtril(fmpz_mod_mat_t mat, flint_rand_t state, int unit, const fmpz_mod_ctx_t ctx)
{
fmpz* e;
slong i, j;
for (i = 0; i < fmpz_mod_mat_nrows(mat, ctx); i++)
{
for (j = 0; j < fmpz_mod_mat_ncols(mat, ctx); j++)
{
e = fmpz_mod_mat_entry(mat, i, j);
if (j < i)
{
fmpz_randm(e, state, ctx->n);
}
else if (i == j)
{
fmpz_randm(e, state, ctx->n);
if (unit || fmpz_is_zero(e))
fmpz_one(e);
}
else
{
fmpz_zero(e);
}
}
}
}