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

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Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages