dspl/stat__std_8c_source.html

/*

* Copyright (c) 2015-2024 Sergey Bakhurin

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

*

* This file is part of DSPL.

*

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

* it under the terms of the GNU 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 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 stat_std(double* x, int n, double* s)

{

    int k, err;

    double sum, m;

    err = mean(x, n, &m);

    if(err != RES_OK)

        goto exit_label;

    sum = (x[0] - m) * (x[0] - m);

    for(k = 1; k < n; k++)

        sum += (x[k] - m) * (x[k] - m);

    (*s) = sqrt(sum / (double)(n-1));

exit_label:

    return err;

}