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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>
#ifndef WITHOUT_LAPACK
#include "lapack.h"
#else
#include "multiplication.h"
#include "division.h"
#include "subtraction.h"
#include "sqrt.h"
#endif
#include "chol.h"
void zchola(doubleComplex * in, int size, doubleComplex *out){
/* param in : input matrix (square matrix)
param size : number of rows or columns
param out : output upper triangular matrix
*/
#ifndef WITHOUT_LAPACK
int i=0, j=0, info=0;
for(i=0;i<size*size;i++) out[i]=in[i];
C2F(zpotrf)("U", &size, out, &size, &info);
/*Zeros in the lower triangular part*/
for (i=0;i<size;i++){
for (j=i+1;j<size;j++){
out[j+i*size]=DoubleComplex(0,0);
}
}
#else
/* Do not use Lapack functions*/
int i=0, j=0, k=0;
doubleComplex tmp,transposee;
double accu;
for (i=0;i<size;i++){
accu=0.0f;
for (j=0;j<i;j++){
tmp=in[i*size+j];
for (k=0;k<j;k++){
transposee=DoubleComplex(zreals(out[j*size+k]),-zimags(out[j*size+k]));
tmp = zdiffs(tmp,zmuls(out[i*size+k],transposee));
}
out[i*size+j]= zrdivs(tmp,out[j*size+j]);
accu += zreals(out[i*size+j])*zreals(out[i*size+j]);
accu += zimags(out[i*size+j])*zimags(out[i*size+j]);
}
tmp = DoubleComplex(zreals(in[i*size+i])-accu,0);
out[i*size+i]=zsqrts(tmp);
}
/*Zeros in the lower triangular part*/
for (i=0;i<size;i++){
for (j=i+1;j<size;j++){
out[j+i*size]=DoubleComplex(0,0);
}
}
#endif
}
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