STPRECOND

STPRECOND = “precond” - A special type of ST intended for use with preconditioned eigensolvers.

Note

This is not a true spectral transformation. It behaves as an “inexact” version of the STSINVERT operator, in the sense that the associated KSP and PC objects can be used to implement a preconditioner \(K^{-1}\approx(A-\sigma B)^{-1}\) in the context of preconditioned eigensolvers such as Jacobi-Davidson.

See Also

ST: Spectral Transformation, ST, STType, STSetType(), STSetMatrices(), STSetShift()

Level

beginner

Location

src/sys/classes/st/impls/precond/precond.c

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