STSINVERT

STSINVERT = “sinvert” - The shift-and-invert spectral transformation.

Notes

The operator in this ST is \((A-\sigma B)^{-1}B\), where \(A\) and \(B\) are the matrices set with STSetMatrices() and the shift \(\sigma\) is given in STSetShift().

This is used to enhance convergence of eigenvalues in the neighborhood of \(\sigma\), at the cost of solving a system of linear equations at each eigensolver step.

See Also

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

Level

beginner

Location

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

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