Results 1 to 10 of about 1,836,247 (186)
Three-Dimensional Microwave Imaging: Fast and Accurate Computations with Block Resolution Algorithms [PDF]
Sensors, 2020 This paper considers the microwave imaging reconstruction problem, based on additive penalization and gradient-based optimization. Each evaluation of the cost function and of its gradient requires the resolution of as many high-dimensional linear systems
Corentin Friedrich +3 more
doaj +2 more sources
On Accurate Computations of the Perron Root [PDF]
SIAM Journal on Matrix Analysis and Applications, 1993 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Elsner, Ludwig +3 more
openaire +6 more sources
Accurate computations with Lupaş matrices [PDF]
Applied Mathematics and Computation, 2017 Lupas q-analogues of the Bernstein functions play an important role in Approximation Theory and Computer Aided Geometric Design. Their collocation matrices are called Lupas matrices. In this paper, we provide algorithms for computing the bidiagonal decomposition of these matrices and their inverses to high relative accuracy. It is also shown that these
Jorge Delgado, J M Pena
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Accurate and fast computations with Green matrices
Applied Mathematics Letters, 2023 This paper provides a linear time complexity method to obtain the bidiagonal decomposition of Green matrices with high relative accuracy. In addition, when the Green matrix is nonsingular and totally positive, this bidiagonal decomposition can be used to compute the eigenvalues, the inverse and the solution of some linear system of equations with high ...
Juan Manuel Pena +2 more
exaly +5 more sources
Accurate Computations with Totally Nonnegative Matrices [PDF]
SIAM Journal on Matrix Analysis and Applications, 2007 We consider the problem of performing accurate computations with rectangular $(m\times n)$ totally nonnegative matrices. The matrices under consideration have the property of having a unique representation as products of nonnegative bidiagonal matrices. Given that representation, one can compute the inverse, LDU decomposition, eigenvalues, and SVD of a
Plamen Koev
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Accurate Computations with Generalized Green Matrices
SymmetryWe consider generalized Green matrices that, in contrast to Green matrices, are not necessarily symmetric. In spite of the loss of symmetry, we show that they can preserve some nice properties of Green matrices. In particular, they admit a bidiagonal decomposition.
Juan Manuel Pena +2 more
exaly +4 more sources
Benchmarking quantum chemical methods with X-ray structures via structure-specific restraints [PDF]
IUCrJThere is a need for fast, efficient and accurate solid-state structure optimization for imprecise crystal structures (`augmentation') for subsequent property prediction in the pharmaceutical industry.
Birger Dittrich +4 more
doaj +2 more sources
Conditioning and accurate computations with Pascal matrices
Journal of Computational and Applied Mathematics, 2013 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Pedro Alonso +2 more
exaly +3 more sources
Green Matrices, Minors and Hadamard Products
Axioms, 2023 Green matrices are interpreted as discrete version of Green functions and are used when working with inhomogeneous linear system of differential equations.
Jorge Delgado +2 more
doaj +1 more source
Fast and Accurate Seismic Computations in Laterally Varying Environments
IEEE Access, 2021 The parabolic equation method provides an unrivaled combination of computational efficiency and accuracy for wave propagation problems in the geosciences in which the environment has strong vertical variations and gradual horizontal variations.
Michael D. Collins +2 more
doaj +1 more source