Shift-invert method descriptor.

Shift-invert method descriptor.

Usage

shift_invert(sigma, solve = NULL, factorization = NULL, max_subspace = NULL)

Arguments

sigma

Shift value sigma.

solve

Optional user-supplied solve operator for (A - sigma B).

factorization

Optional precomputed factorization handle.

max_subspace

Optional maximum Krylov subspace size for the Lanczos (Hermitian) or Krylov-Schur Arnoldi (nonsymmetric) iteration on the inverted operator. NULL uses the route default.

Value

An eigencore_method descriptor selecting shift-invert.