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- Caterina Fenu, David R. Martin, Lothar Reichel, Giuseppe Rodriguez
- SIAM J. Matrix Analysis Applications
- 2013

Approximations of matrix-valued functions of the form WT f(A)W , where A ∈ Rm×m is symmetric, W ∈ Rm×k , with m large and k m, has orthonormal columns, and f is a function, can be computed by applying a few steps of the symmetric block Lanczos method to A with initial block-vector W ∈ Rm×k . Golub and Meurant have shown that the approximants obtained in… (More)

- Caterina Fenu, David R. Martin, Lothar Reichel, Giuseppe Rodriguez
- SIAM J. Scientific Computing
- 2013

Large-scale networks arise in many applications. It is often of interest to be able to identify the most important nodes of a network or to ascertain the ease of traveling between nodes. These and related quantities can be determined by evaluating expressions of the form uT f(A)w, where A is the adjacency matrix that represents the graph of the network, f… (More)

- J. Baglama, C. Fenu, L. Reichel, G. Rodriguez
- 2014

Large-scale networks arise in many applications. It is often of interest to be able to identify the most important nodes of a network or to determine the ease of traveling between them. We are interested in carrying out these tasks for directed networks. These networks have a nonsymmetric adjacency matrix A. Benzi et al. [6] recently proposed that these… (More)

- Caterina Fenu, Desmond J. Higham
- SIAM J. Matrix Analysis Applications
- 2017

Many types of pairwise interaction take the form of a fixed set of nodes with edges that appear and disappear over time. In the case of discrete-time evolution, the resulting evolving network may be represented by a time-ordered sequence of adjacency matrices. We consider here the issue of representing the system as a single, higher dimensional block… (More)

- Caterina Fenu, Lothar Reichel, Giuseppe Rodriguez
- Numerical Lin. Alg. with Applic.
- 2016

Generalized Cross Validation (GCV) is a popular approach to determining the regularization parameter in Tikhonov regularization. The regularization parameter is chosen by minimizing an expression, which is easy to evaluate for small-scale problems, but prohibitively expensive to compute for large-scale ones. This paper describes a novel method, based on… (More)

- Francesca Arrigo, Michele Benzi, Caterina Fenu
- SIAM J. Matrix Analysis Applications
- 2016

We develop numerical algorithms for the efficient evaluation of quantities associated with generalized matrix functions [J. B. Hawkins and A. Ben-Israel, Linear and Multilinear Algebra, 1(2), 1973, pp. 163–171]. Our algorithms are based on Gaussian quadrature and Golub–Kahan bidiagonalization. Block variants are also investigated. Numerical experiments are… (More)

- G. P. Deidda, C. Fenu, G. Rodriguez
- 2014

Electromagnetic induction measurements are often used for non-destructive investigation of certain soil properties, which are affected by the electromagnetic features of the subsurface layers. Knowing such parameters allows one to identify inhomogeneities in the ground, and to ascertain the presence and the spatial position of particular conductive… (More)

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