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

KSP: Linear System Solvers, 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