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Migration from SVN

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quemy 2012-08-30 11:30:11 +02:00
commit 8cd56f37db
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branches/rc2.0/eo/src/es/eig.h
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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