Search Results - subject:"Gram matrix"

Asymptotic error bounds for kernel-based Nyström low-rank approximation matrices

Chang, Lo-Bin; Bai, Zhidong; Huang, Su-Yun; Hwang, Chii-Ruey - In: Journal of Multivariate Analysis 120 (2013) C, pp. 102-119

of a full kernel Gram matrix K. This article considers the Nyström low-rank approximation. It uses a reduced kernel K̂ …

Persistent link: https://www.econbiz.de/10011041984

Preconditioning by Gram matrix approximation for diffusion–convection–reaction equations with discontinuous coefficients

Juncu, Gh.; Popa, C. - In: Mathematics and Computers in Simulation (MATCOM) 60 (2002) 6, pp. 487-506

This work analyses the preconditioning with Gram matrix approximation for the numerical solution of a linear convection … the discrete linear system: CGS, CGSTAB and GMRES. The preconditioning with Gram matrix approximation consists of …

Persistent link: https://www.econbiz.de/10010749906

Numerical experiments with preconditioning by gram matrix approximation for non-linear elliptic equations

Juncu, Gheorghe; Popa, Constantin - In: Mathematics and Computers in Simulation (MATCOM) 52 (2000) 1, pp. 53-71

The paper analyzes the numerical performances of the Gram matrix approximations preconditioning for solving non … iteration. The Gram matrix approximations consist in replacing the exact solution of the equation with the preconditioner by few …

Persistent link: https://www.econbiz.de/10010870173

Preconditioning by approximations of the Gram matrix for convection–diffusion equations

Juncu, Gh.; Popa, C. - In: Mathematics and Computers in Simulation (MATCOM) 48 (1998) 2, pp. 225-233

The paper analyses the numerical performance of preconditioning with Gram matrix approximations for the solution of a … gradient algorithms: CGS and GMRES. The preconditioning with Gram matrix approximations consists of replacing the solving of …

Persistent link: https://www.econbiz.de/10010749330