Calculates lowest and highest eigenvalues of the original Burden matrix and the three variant introduced by Pearlamn and Smith (ref: R. S. Pearlman and K.M. Smith: Novel Software Tools for Chemical Diversity, Perspectives in Drug Discovery and Design, 9/10/11: 339-353, 1998.) These three variants are: atom charge, atom polarizability and hydrogen bond acceptor/donor properties. The number of lowest and/or highest eigenvalues to be calculated are specified in the corresponding parameter configuration.
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