dspl/random__init_8c_source.html

/*

* Copyright (c) 2015-2024 Sergey Bakhurin

* Digital Signal Processing Library [http://dsplib.org]

*

* This file is part of libdspl-2.0.

*

* is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser    General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* DSPL 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 Lesser General Public License

* along with Foobar.    If not, see <http://www.gnu.org/licenses/>.

*/


#include <stdlib.h>

#include <math.h>

#include <time.h>


#include "dspl.h"

#include "randomgen.h"


#ifdef DOXYGEN_ENGLISH


#endif

#ifdef DOXYGEN_RUSSIAN


#endif

int DSPL_API random_init(random_t* prnd, int type, void* seed)

{

    srand(time(NULL));


    if(!prnd)

        return RES_OK;


    switch(type)

    {

        case RAND_TYPE_MRG32K3A:

            /* MRG32k3a init */

            prnd->mrg32k3a_x[0] = prnd->mrg32k3a_x[1] = 1.0;

            prnd->mrg32k3a_y[0] = prnd->mrg32k3a_y[1] =

                                  prnd->mrg32k3a_y[2] = 1.0;

            if(seed)

                prnd->mrg32k3a_x[2] = *((double*)seed);

            else

                prnd->mrg32k3a_x[2] = (double) rand() * rand();

            break;

        case RAND_TYPE_MT19937:

            if(seed)

                mt19937_init_genrand64(*((unsigned long long*)seed), prnd);

            else

                mt19937_init_genrand64((unsigned long long)rand()*rand(), prnd);

            break;

        default:

            return ERROR_RAND_TYPE;

    }

    prnd->type = type;


    return RES_OK;

}