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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 "spec.h"
#include "lapack.h"
#include "zeros.h"
#include "max.h"
void dspeca(double* in, int rows,double* out){
int i=0, j=0;
int symmetric=0;
int INFO=0;
int iWorkSize = 0;
double* pdblWork;
double* outReal;
double* outImag;
double* pdblLeftvectors;
double* pdblRightvectors;
double* inCopy;
inCopy = (double*)malloc((unsigned int)(rows*rows) * sizeof(double));
outReal = (double*)malloc((unsigned int)rows * sizeof(double));
outImag = (double*)malloc((unsigned int)rows * sizeof(double));
pdblLeftvectors=NULL;
pdblRightvectors=NULL;
iWorkSize = 3*rows;
pdblWork = (double*)malloc((unsigned int)iWorkSize * sizeof(double));
for(i=0;i<rows*rows;i++) inCopy[i]=in[i];
/* look if the matrix is symmetric */
for (i=0;i<rows;i++)
for (j=0;j<rows;j++)
if (in[i*rows+j]!=in[i+j*rows]) break;
/* the matrix is symmetric if the 2 loops goes to end i.e
i==rows and j==rows */
if ((i==rows)&&(j==rows)) symmetric=1;
/* apply lapack function according to symmetry */
if(symmetric){
C2F(dsyev)( "N", "U", &rows, in, &rows, outReal, pdblWork, &iWorkSize, &INFO );
}
else {
C2F(dgeev)( "N", "N", &rows, inCopy, &rows, outReal, outImag,
pdblLeftvectors, &rows, pdblRightvectors, &rows, pdblWork, &iWorkSize, &INFO );
}
for (i=0;i<rows;i++) out[i]=outReal[i];
free(inCopy);
free(outReal);
free(outImag);
free(pdblWork);
free(pdblLeftvectors);
free(pdblRightvectors);
}
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