randtest.c

/*
    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 "nmod_vec.h"

void _nmod_vec_rand(nn_ptr vec, flint_rand_t state, slong len, nmod_t mod)
{
    slong i;
    for (i = 0; i < len; i++)
        vec[i] = n_randint(state, mod.n);
}

void _nmod_vec_randtest(nn_ptr vec, flint_rand_t state, slong len, nmod_t mod)
{
    slong i, sparseness;

    if (n_randint(state, 2))
    {
        for (i = 0; i < len; i++)
            vec[i] = n_randtest(state) % mod.n;
    }
    else
    {
        sparseness = 1 + n_randint(state, FLINT_MAX(2, len));

        for (i = 0; i < len; i++)
        {
            if (n_randint(state, sparseness))
                vec[i] = 0;
            else
                vec[i] = n_randtest(state) % mod.n;
        }
    }
}