smod_arpack_shift_invert Submodule

Module containing the implementation for the ARPACK shift-invert-type solver, that is, given the general eigenvalue problem $$AX = \omega BX,$$ choose a shift $\sigma$ and solve the problem $$(A - \sigma B)X = \omega X,$$ thereby finding $k$ eigenvalues of the shifted problem that satisfy a given criterion.

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Module Procedures

solve_arpack_shift_invert

Module Procedures

module procedure solve_arpack_shift_invert module module subroutine solve_arpack_shift_invert(arpack_cfg, matrix_A, matrix_B, settings, omega, vr) Interface →

Implementation of the ARPACK shift-invert solver

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Arguments

Type	Intent	Optional	Attributes		Name
type(arpack_t),	intent(in)			::	arpack_cfg	arpack configuration
type(matrix_t),	intent(in)			::	matrix_A	matrix A
type(matrix_t),	intent(in)			::	matrix_B	matrix B
type(settings_t),	intent(in)			::	settings	settings object
complex(kind=dp),	intent(out)			::	omega(:)	array with eigenvalues
complex(kind=dp),	intent(out)			::	vr(:,:)	array with right eigenvectors