2.3-1/src/c/statisticsFunctions/variance/zvariancea.c


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/*
 *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 *  Copyright (C) 2008-2008 - INRIA - Allan SIMON
 *
 *  This file must be used under the terms of the CeCILL.
 *  This source file is licensed as described in the file COPYING, which
 *  you should have received as part of this distribution.  The terms
 *  are also available at
 *  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
 *
 */

#include "variance.h"

doubleComplex	zvariancea(doubleComplex *in, int size)
{
    int i = 0 ;
    
    doubleComplex sum  = DoubleComplex ( 0 , 0 ) ;
    doubleComplex temp = DoubleComplex ( 0 , 0 ) ; 
    doubleComplex variance = DoubleComplex ( 0 , 0 );
    doubleComplex mean =  zmeana ( in , size ) ;

    for ( i = 0 ; i < size ; i++)
    {
       temp = zdiffs( in[i] , mean ) ;
       sum  = zadds ( sum , zpows ( temp  , DoubleComplex ( 2, 0) ) ); 
      }
 
    variance = zrdivs (sum , DoubleComplex ( (size - 1),0 ));
  
    return variance ;

}