Concept
Matrice bande
Publications associées (55)
MATHICSE Technical Report : Fast computation of spectral projectors of banded matrices
We consider the approximate computation of spectral projectors for symmetric banded matrices. While this problem has received considerable attention, especially in the context of linear scaling electronic structure methods, the presence of small relative s ...
MATHICSE2016Accelerated Spectral Clustering Using Graph Filtering of Random Signals
Pierre Vandergheynst, Rémi Gribonval, Gilles Puy, Nicolas Tremblay
We build upon recent advances in graph signal processing to propose a faster spectral clustering algorithm. Indeed, classical spectral clustering is based on the computation of the first eigenvectors of the similarity matrix' Laplacian, whose computati ...
Ieee2016ALS Scheme using Extent-based Constraints for the Analysis of Chemical Reaction Systems
Dominique Bonvin, Julien Léo Billeter, Michael Amrhein
Multivariate curve resolution via alternating least squares (ALS) is used to resolve the concentration profiles C and the pure component spectra E of S species from the multivariate absorbance data A, assuming the bilinear model ...
2016Convex block-sparse linear regression with expanders - provably
Volkan Cevher, Quoc Tran Dinh, Anastasios Kyrillidis, Luca Baldassarre, Bubacarr Bah
Sparse matrices are favorable objects in machine learning and optimization. When such matrices are used, in place of dense ones, the overall complexity requirements in optimization can be significantly reduced in practice, both in terms of space and run-ti ...
2016Effect of hydrostatic pressure on flow and deformation in highly reinforced particulate composites
Andreas Mortensen, Ludger Weber, Maria Gabriella Tarantino
Infiltrated particle reinforced composites combine a dense matrix with particles that are in mutual contact and can therefore transfer compressive stress directly from one particle to the next. As a result, these composites may combine characteristics of t ...
Elsevier2016Nonadiabatic dynamics with intersystem crossings: A time-dependent density functional theory implementation
In this work, we derive a method to perform trajectory-based nonadiabatic dynamics that is able to describe both nonadiabatic transitions and intersystem crossing events (transitions between states of different spin-multiplicity) at the same level of theor ...
Amer Inst Physics2015Evaluating functions of positive-definite matrices using colored-noise thermostats
Michele Ceriotti, Michele Parrinello
Many applications in computational science require computing the elements of a function of a large matrix. A commonly used approach is based on the the evaluation of the eigenvalue decomposition, a task that, in general, involves a computing time that scal ...
Amer Physical Soc2014The local Callan-Symanzik equation: structure and applications
Riccardo Rattazzi, Boaz Keren Zur, Lorenzo Vitale, Florent Baume
The local Callan-Symanzik equation describes the response of a quantum field theory to local scale transformations in the presence of background sources. The consistency conditions associated with this anomalous equation imply non-trivial relations among t ...
Springer2014MR Image Reconstruction from Generalized Projections
Purpose: Currently, the time required for image reconstruction is prohibitively long if data are acquired using multidimensional imaging trajectories that make use of multichannel systems equipped with nonlinear gradients. Methods are presented that reduce ...
Wiley-Blackwell2014Impact of tunneling anisotropy on the conductivity of nanorod dispersions
Claudio Grimaldi, Biagio Nigro
While the tunneling conductance between two spherical-like conducting particles depends on the relative interparticle distance, the wave function overlap between states of two rodlike particles, and so the tunneling conductance, depends also on the relativ ...
American Physical Society2014