subroutine, public deigensolver_cg(namespace, mesh, st, hm, xc, pre, tol, niter, converged, ik, diff, energy_change_threshold, orthogonalize_to_all, conjugate_direction, additional_terms, shift)
conjugate-gradients method.
subroutine, public zeigensolver_cg(namespace, mesh, st, hm, xc, pre, tol, niter, converged, ik, diff, energy_change_threshold, orthogonalize_to_all, conjugate_direction, additional_terms, shift)
conjugate-gradients method.