pqc/external/flint-2.4.3/nmod_mat/randtril.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2011 Fredrik Johansson
******************************************************************************/
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "nmod_mat.h"
void
nmod_mat_randtril(nmod_mat_t mat, flint_rand_t state, int unit)
{
slong i, j;
for (i = 0; i < mat->r; i++)
{
for (j = 0; j < mat->c; j++)
{
if (j < i)
{
nmod_mat_entry(mat, i, j) = n_randlimb(state) % (mat->mod.n);
}
else if (i == j)
{
nmod_mat_entry(mat, i, j) = n_randlimb(state) % (mat->mod.n);
if (unit || nmod_mat_entry(mat, i, j) == UWORD(0))
nmod_mat_entry(mat, i, j) = UWORD(1);
}
else
{
nmod_mat_entry(mat, i, j) = UWORD(0);
}
}
}
}