Results 11 to 20 of about 12,511,953 (289)

The conjugate gradient method [PDF]

open access: yesThe Leading Edge, 2018
The conjugate gradient method can be used to solve many large linear geophysical problems — for example, least-squares parabolic and hyperbolic Radon transform, traveltime tomography, least-squares migration, and full-waveform inversion (FWI) (e.g., Witte et al., 2018).
Karl Schleicher
openaire   +2 more sources

Two Versions of the Spectral Nonlinear Conjugate Gradient Method [PDF]

open access: yesAl-Mustansiriyah Journal of Science, 2018
The nonlinear conjugate gradient method is widely used to solve unconstrained optimization problems. In this paper the development of different versions of nonlinear conjugate gradient methods with global convergence properties proved.
Basim A. Hassan, Haneen A. Alashoor
doaj   +2 more sources

Improvement of conjugate gradient methods for removing impulse noise images [PDF]

open access: yes, 2023
Optimization problems occur in most disciplines like engineering, physics, mathematics, economics, administration, commerce, social sciences, and even politics.
Ahmed A. Abdullah, Ali   +3 more
core   +1 more source

New iterative conjugate gradient method for nonlinear unconstrained optimization [PDF]

open access: yes, 2022
Conjugate gradient methods (CG) are an important class of methods for solving unconstrained optimization problems, especially for large-scale problems. Recently, they have been much studied.
Badreddine Sellami   +2 more
core   +2 more sources

Block Preconditioning for the Conjugate Gradient Method [PDF]

open access: yesSIAM Journal on Scientific and Statistical Computing, 1985
Block preconditionings for the conjugate gradient method are investigated for solving positive definite block tridiagonal systems of linear equations arising from discretization of boundary value problems for elliptic partial differential equations. The preconditionings rest on the use of sparse approximate matrix inverses to generate incomplete block ...
Concus, P., Golub, G.H., Meurant, G.
openaire   +3 more sources

Moving force identification based on modified preconditioned conjugate gradient method [PDF]

open access: yes, 2018
This paper develops a modified preconditioned conjugate gradient (M-PCG) method for moving force identification (MFI) by improving the conjugate gradient (CG) and preconditioned conjugate gradient (PCG) methods with a modified Gram-Schmidt algorithm. The
Zhen Chen   +5 more
core   +1 more source

A Bayesian Conjugate Gradient Method

open access: yesCoRR, 2018
No description ...
Cockayne, Jon   +3 more
openaire   +3 more sources

Conjugate gradient algorithms for conic functions [PDF]

open access: yes, 1986
summary:The paper contains a description and an analysis of two modifications of the conjugate gradient method for unconstrained minimization which find a minimum of the conic function after a finite number of steps.
Lukšan, Ladislav
core   +1 more source

Performance Gains in Conjugate Gradient Computation with Linearly Connected GPU Multiprocessors [PDF]

open access: yes, 2014
Conjugate gradient is an important iterative method used for solving least squares problems. It is compute-bound and generally involves only simple matrix computations.
Lin, Tsung-Han, Tarsa, Stephen, Kung, H.
core   +6 more sources

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