KSPCGS#
This code implements the CGS (Conjugate Gradient Squared) method [Son89].
Notes#
Does not require a symmetric matrix. Does not apply transpose of the matrix.
Supports left and right preconditioning, but not symmetric.
Developer Note#
Has this weird support for doing the convergence test with the natural norm, I assume this works only with no preconditioning and symmetric positive definite operator.
References#
[Son89]
Peter Sonneveld. CGS, a fast Lanczos-type solver for nonsymmetric linear systems. SIAM J. Sci. Stat. Comput., 10:36–52, 1989.
See Also#
KSP: Linear System Solvers, KSPCreate(), KSPSetType(), KSPType, KSP, KSPBCGS, KSPSetPCSide()
Level#
beginner
Location#
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages