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git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@2710 331e1502-861f-0410-8da2-ba01fb791d7f
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quemy 2012-07-16 09:38:48 +00:00
commit e3a610506b
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branches/rc2.0/eo/src/es/eig.h Normal file
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#ifndef EIG_H__
#define EIG_H__
#include <matrices.h>
#include <valarray>
namespace eo {
/* ========================================================= */
/*
Calculating eigenvalues and vectors.
Input:
N: dimension.
C: lower_triangular NxN-matrix.
niter: number of maximal iterations for QL-Algorithm.
Output:
diag: N eigenvalues.
Q: Columns are normalized eigenvectors.
return: number of iterations in QL-Algorithm.
*/
extern int eig( int N, const lower_triangular_matrix& C, std::valarray<double>& diag, square_matrix& Q,
int niter = 0);
} // namespace eo
#endif