petsc-3.10.2 2018-10-09
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KSPFCG

Implements the Flexible Conjugate Gradient method (FCG)

Options Database Keys

-ksp_fcg_mmax <N> - maximum number of search directions
-ksp_fcg_nprealloc <N> - number of directions to preallocate
-ksp_fcg_truncation_type <standard,notay> - truncation approach for directions

Contributed by Patrick Sanan

Notes

Supports left preconditioning only.

References

1. - Notay, Y."Flexible Conjugate Gradients", SIAM J. Sci. Comput. 22:4, 2000
2. - Axelsson, O. and Vassilevski, P. S. "A Black Box Generalized Conjugate Gradient Solver with Inner Iterations and Variable step Preconditioning", SIAM J. Matrix Anal. Appl. 12:4, 1991

.seealso : KSPGCR, KSPFGMRES, KSPCG, KSPFCGSetMmax(), KSPFCGGetMmax(), KSPFCGSetNprealloc(), KSPFCGGetNprealloc(), KSPFCGSetTruncationType(), KSPFCGGetTruncationType()

Level

beginner

Location

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