petsc-3.13.6 2020-09-29
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KSPCGS

 This code implements the CGS (Conjugate Gradient Squared) method.

Options Database Keys

see KSPSolve() -

References

1. -Sonneveld, 1989.

Notes

Does not require a symmetric matrix. Does not apply transpose of the matrix. Supports left and right preconditioning, but not symmetric.

Developer Notes

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.

See Also

KSPCreate(), KSPSetType(), KSPType (for list of available types), KSP, KSPBCGS, KSPSetPCSide()

Level

beginner

Location

src/ksp/ksp/impls/cgs/cgs.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages