low_rank_preconditioner_model.F File Reference

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Modules
module	low_rank_preconditioner_model
	Small algebraic helpers for the rotationally covariant low-rank OT preconditioner.

Functions/Subroutines
pure elemental real(kind=dp) function, public	low_rank_preconditioner_model::low_rank_inverse_weight (eigenvalue, reference, energy_gap)
	Spectral inverse weight relative to a common occupied reference level.
pure integer function, public	low_rank_preconditioner_model::low_rank_select_rank (eigenvalues, nocc, max_rank, degeneracy_tolerance)
	Select a bounded spectral rank without cutting a degenerate boundary manifold.
pure subroutine, public	low_rank_preconditioner_model::apply_low_rank_dense (overlap_inverse, vectors, eigenvalues, reference, energy_gap, spectral_window, matrix_in, matrix_out)
	Dense reference application used to verify right covariance under orbital rotations.