dspl/fourier__series__rec_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 <string.h>

#include <math.h>

#include "dspl.h"


#ifdef DOXYGEN_ENGLISH


#endif

#ifdef DOXYGEN_RUSSIAN


#endif

int DSPL_API fourier_series_rec(double* w, complex_t* s, int nw,

                        double* t, int nt, complex_t* y)

{

    int k, m;

    complex_t e;


    if(!t || !s || !w || !y)

        return ERROR_PTR;

    if(nt<1 || nw < 1)

        return ERROR_SIZE;


    memset(y, 0, nt*sizeof(complex_t));


    for(k = 0; k < nw; k++)

    {

        for(m = 0; m < nt; m++)

        {

            RE(e) =    cos(w[k] * t[m]);

            IM(e) =    sin(w[k] * t[m]);


            RE(y[m]) += CMRE(s[k], e);

            IM(y[m]) += CMIM(s[k], e);

        }

    }

    return RES_OK;

}