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/*
Copyright (C) 2010 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.h"
#include "fmpz_mat.h"
void
fmpz_mat_randops(fmpz_mat_t mat, flint_rand_t state, slong count)
{
slong c, i, j, k;
slong m = mat->r;
slong n = mat->c;
if (mat->r == 0 || mat->c == 0)
return;
for (c = 0; c < count; c++)
{
if (n_randint(state, 2))
{
if ((i = n_randint(state, m)) == (j = n_randint(state, m)))
continue;
if (n_randint(state, 2))
for (k = 0; k < n; k++)
fmpz_add(&mat->rows[j][k], &mat->rows[j][k],
&mat->rows[i][k]);
else
for (k = 0; k < n; k++)
fmpz_sub(&mat->rows[j][k], &mat->rows[j][k],
&mat->rows[i][k]);
}
else
{
if ((i = n_randint(state, n)) == (j = n_randint(state, n)))
continue;
if (n_randint(state, 2))
for (k = 0; k < m; k++)
fmpz_add(&mat->rows[k][j], &mat->rows[k][j],
&mat->rows[k][i]);
else
for (k = 0; k < m; k++)
fmpz_sub(&mat->rows[k][j], &mat->rows[k][j],
&mat->rows[k][i]);
}
}
}