pade_utils.py
b68d96516204feature_greedy_coarseni…

pade_utils.py
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			# Copyright (C) 2018 by the RROMPy authors
			#
			# This file is part of RROMPy.
			#
			# RROMPy is free software: you can redistribute it and/or modify
			# it under the terms of the GNU Lesser General Public License as published by
			# the Free Software Foundation, either version 3 of the License, or
			# (at your option) any later version.
			#
			# RROMPy is distributed in the hope that it will be useful,
			# but WITHOUT ANY WARRANTY; without even the implied warranty of
			# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			# GNU Lesser General Public License for more details.
			#
			# You should have received a copy of the GNU Lesser General Public License
			# along with RROMPy. If not, see <http://www.gnu.org/licenses/>.
			#

			import numpy as np
			from rrompy.utilities.base.types import Np1D, Np2D, Tuple
			from rrompy.utilities.warning_manager import warn

			def checkRobustTolerance(ev:Np1D, E:int, tol:float) -> dict:
			N = len(ev) - 1
			ts = tol * np.linalg.norm(ev)
			diff = N - np.sum(np.abs(ev) >= ts)
			if diff <= 0: return {}
			Enew = E - diff
			Nnew = min(N, Enew)
			if Nnew == N:
			strN = ""
			else:
			strN = "N from {} to {} and ".format(N, Nnew)
			warn(("Smallest {} eigenvalues below tolerance.\nReducing {}E from {} to "
			"{}.").format(diff + 1, strN, E, Enew))
			newParameters = {"N" : Nnew, "E" : Enew}
			return newParameters