3 citations · 6 across the 4 of their papers we have counts for
4 papers
Generalized Golub-Kahan bidiagonalization for nonsymmetric saddle point systems
Andrei Dumitrasc, Carola Kruse, Ulrich Ruede
The generalized Golub-Kahan bidiagonalization has been used to solve saddle-point systems where the leading block is symmetric and positive definite. We extend this iterative metho…
Deflation for the off-diagonal block in symmetric saddle point systems
Andrei Dumitrasc, Carola Kruse, Ulrich Ruede
Deflation techniques are typically used to shift isolated clusters of small eigenvalues in order to obtain a tighter distribution and a smaller condition number. Such changes induc…
Inexact inner-outer Golub-Kahan bidiagonalization method: A relaxation strategy
Vincent Darrigrand, Andrei Dumitrasc, Carola Kruse +1
We study an inexact inner-outer generalized Golub-Kahan algorithm for the solution of saddle-point problems with a two-times-two block structure. In each outer iteration, an inner…
On numerical solution of full rank linear systems
A. Dumitrasc, Ph. Leleux, C. Popa +2
Matrices can be augmented by adding additional columns such that a partitioning of the matrix in blocks of rows defines mutually orthogonal subspaces. This augmented system can the…