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New: PreconditionChebyshev can now also estimate eigenvalues with the power | ||
method, rather than the Lanczos algorithm underlying the SolverCG | ||
estimation. This is useful for matrices that are slightly non-symmetric such | ||
that the eigenvalue estimate of SolverCG breaks down, but not too much so that | ||
the Chebyshev iteration is still a useful iteration. | ||
<br> | ||
(Martin Kronbichler, 2022/05/23) |