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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 "stdevf.h"
#include "meanf.h"
void scolumnstdevfa(float *in1, int lines, int columns, float *in2, float* out){
int i = 0;
int j = 0;
float temp = 0.0f;
float accumulate = 0.0f;
float accumulateFre = 0.0f ;
scolumnmeanfa(in1, lines, columns, in2, out );
/*we first multiply each cell of the input matrix by its coefficient*/
for (j = 0; j < lines; ++j)
{
accumulate = 0.0f;
accumulateFre= 0.0f;
temp = 0.0f;
for ( i = 0 ; i < columns; ++i )
{
temp = spows ( (in1[lines*i + j] - out[j] ) ,2 );
temp *= in2[lines*i + j];
accumulate += temp ;
accumulateFre += in2[lines*i + j];
}
if (lines <= 1)
{
out[j] = 0.0f * accumulate ;
}
else
{
out[j] = ssqrts(accumulate / (accumulateFre - 1));
}
}
}
/*
!
! elseif o == 'c' | o == 2 then !
! // here ones is used becaue we work on matrix , but in C we work on element so we only need iteratation !
! y = x - meanf(x, fre, o) * ones(1, size(x, o)) !
! !
! if size(x, 1) == 1 then ! !
! s = 0 * sum(y.^2 .* fre, o) !
! else ! !
! s = sqrt(sum(y.^2 .* fre, o) ./ (sum(fre, o) - 1)); !
!
*/
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