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/*
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 2008 - INRIA - Arnaud TORSET
*
* 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 <stdlib.h>
#include "dist.h"
#include "matrixTranspose.h"
#include "matrixMultiplication.h"
#include "spec.h"
#include "sqrt.h"
double ddista(double* in1,double* in2, int lines, int columns){
int i=0;
double out=0;
double *a, *at, *mul;
doubleComplex *eigenvalues,*mulCpx;
/* FIXME : malloc here*/
a=(double*)malloc((unsigned int)(lines*columns)*sizeof(double));
at=(double*)malloc((unsigned int)(lines*columns)*sizeof(double));
mul=(double*)malloc((unsigned int)(lines*lines)*sizeof(double));
eigenvalues=(doubleComplex*)malloc((unsigned int)(lines)*sizeof(doubleComplex));
mulCpx=(doubleComplex*)malloc((unsigned int)(lines*lines)*sizeof(doubleComplex));
for (i=0;i<lines*columns;i++) a[i]=in1[i]-in2[i];
dtransposea(a,lines, columns,at);
dmulma(a,lines,columns,at,columns,lines,mul);
for (i=0;i<lines*lines;i++) mulCpx[i]=DoubleComplex(mul[i],0);
zspeca(mulCpx,lines,eigenvalues);
zsqrta(eigenvalues,lines,eigenvalues);
/* Research of the higher value of eigenvalues*/
for (i=0;i<lines;i++){
if (zreals(eigenvalues[i])>out) out = zreals(eigenvalues[i]);
}
free(a);
free(at);
free(mul);
free(eigenvalues);
free(mulCpx);
return out;
}
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