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A hermitian matrix @math{A} can be factorized by similarity
transformations into the form,
where @math{U} is an unitary matrix and @math{T} is a real symmetric
tridiagonal matrix.
- Function: int gsl_linalg_hermtd_decomp (gsl_matrix_complex * A, gsl_vector_complex * tau)
-
This function factorizes the hermitian matrix A into the symmetric
tridiagonal decomposition @math{U T U^T}. On output the real parts of
the diagonal and subdiagonal part of the input matrix A contain
the tridiagonal matrix @math{T}. The remaining lower triangular part of
the input matrix contains the Householder vectors which, together with
the Householder coefficients tau, encode the orthogonal matrix
@math{Q}. This storage scheme is the same as used by LAPACK. The
upper triangular part of A and imaginary parts of the diagonal are
not referenced.
- Function: int gsl_linalg_hermtd_unpack (const gsl_matrix_complex * A, const gsl_vector_complex * tau, gsl_matrix_complex * Q, gsl_vector * d, gsl_vector * sd)
-
This function unpacks the encoded tridiagonal decomposition (A,
tau) obtained from
gsl_linalg_hermtd_decomp
into the
unitary matrix U, the real vector of diagonal elements d and
the real vector of subdiagonal elements sd.
- Function: int gsl_linalg_hermtd_unpack_dsd (const gsl_matrix_complex * A, gsl_vector * d, gsl_vector * sd)
-
This function unpacks the diagonal and subdiagonal of the encoded
tridiagonal decomposition (A, tau) obtained from
gsl_linalg_hermtd_decomp
into the real vectors d and
sd.
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