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/*
Copyright (C) 2005-2009 Damien Stehle
Copyright (C) 2007 David Cade
Copyright (C) 2010 William Hart
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_mat.h"
void
fmpz_mat_randintrel(fmpz_mat_t mat, flint_rand_t state, flint_bitcnt_t bits)
{
const slong c = mat->c, r = mat->r;
slong i, j;
if (c != r + 1)
{
flint_throw(FLINT_ERROR, "Exception (fmpz_mat_randintrel). c != r + 1.\n");
}
for (i = 0; i < r; i++)
{
fmpz_randbits(fmpz_mat_entry(mat, i, 0), state, bits);
for (j = 1; j <= i; j++)
fmpz_zero(fmpz_mat_entry(mat, i, j));
fmpz_one(fmpz_mat_entry(mat, i, i + 1));
for (j = i + 2; j < c; j++)
fmpz_zero(fmpz_mat_entry(mat, i, j));
}
}