PCQR#
Uses a direct solver, based on QR factorization, as a preconditioner
Note#
Usually this will compute an “exact” solution in one iteration and does
not need a Krylov method (i.e. you can use -ksp_type preonly, or
KSPSetType(ksp,KSPPREONLY) for the Krylov method
See Also#
PCCreate(), PCSetType(), PCType, PC, PCSVD,
PCILU, PCLU, PCCHOLESKY, PCICC, PCFactorSetReuseOrdering(), PCFactorSetReuseFill(), PCFactorGetMatrix(),
PCFactorSetFill(), PCFactorSetUseInPlace(), PCFactorSetMatOrderingType(), PCFactorSetColumnPivot(),
PCFactorSetPivotingInBlocks(), PCFactorSetShiftType(), PCFactorSetShiftAmount()
PCFactorReorderForNonzeroDiagonal()
Level#
beginner
Location#
src/ksp/pc/impls/factor/qr/qr.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages