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Paola Favati, Grazia Lotti, Ornella Menchi and Francesco Romani
Frequency analysis is often used to investigate the structure of systems representing multi-scale real-world phenomena. In many different environments, functional relationships characterized by a power law have been recognized, but, in many cases this si...
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Paola Favati, Grazia Lotti, Ornella Menchi and Francesco Romani
The paper deals with the problem of global minimization of a polynomial function expressed through the Frobenius norm of two-dimensional or three-dimensional matrices. An adaptive procedure is proposed which applies a Multistart algorithm according to a ...
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Paola Favati, Grazia Lotti, Ornella Menchi and Francesco Romani
The problem of clustering, that is, the partitioning of data into groups of similar objects, is a key step for many data-mining problems. The algorithm we propose for clustering is based on the symmetric nonnegative matrix factorization (SymNMF) of a sim...
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