dspl/randi_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 randi(int* x, int n, int start, int stop, random_t* prnd)

{

    double z[RAND_BUFSIZE];

    double dx;

    int i, cnt, err;

    if(!x)

        return ERROR_PTR;

    if(n < 1)

        return ERROR_SIZE;


    dx = (double)stop - (double)start;

    cnt = 0;

    while(cnt < n)

    {

        i = cnt % RAND_BUFSIZE;

        if(!i)

        {

            err = randu(z, RAND_BUFSIZE, prnd);

            if(err != RES_OK)

                return err;

        }

        x[cnt] = start + (int)round(z[i] * dx);

        cnt++;

    }

    return RES_OK;

}