/*
* Copyright (c) 2015-2020 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
/*! ****************************************************************************
\ingroup ARRAY_GROUP
\fn int sum(double* x, int n, double* s)
\author Sergey Bakhurin www.dsplib.org
***************************************************************************** */
#endif
#ifdef DOXYGEN_RUSSIAN
/*! ****************************************************************************
\ingroup ARRAY_GROUP
\fn int sum(double* x, int n, double* s)
\author Бахурин Сергей www.dsplib.org
***************************************************************************** */
#endif
int DSPL_API sum_sqr(double* x, int n, double* s)
{
    int i;
    double z = 0.0;
    if(!x || !s)
        return ERROR_PTR;
    if(n<1)
        return ERROR_SIZE;
      
    for(i = 0; i < n; i++)
        z += x[i]*x[i];
    *s = z;
    return RES_OK;
}