dspl/decimate_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 <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "dspl.h"


#ifdef DOXYGEN_ENGLISH


#endif

#ifdef DOXYGEN_RUSSIAN


#endif

int DSPL_API decimate(double* x, int n, int d, double* y, int* cnt)

{

    int k = 0, i = 0;

    if(!x || !y)

        return ERROR_PTR;

    if(n < 1)

        return ERROR_SIZE;

    if(d < 1)

        return ERROR_NEGATIVE;


    k = i = 0;

    while(k + d <= n)

    {

        y[i] = x[k];

        k+=d;

        i++;

    }

    if(cnt)

        *cnt = i;


    return RES_OK;

}