PCQR

Uses a direct solver, based on QR factorization, as a preconditioner

Notes

This is usually used as a preconditioner for KSPLSQR

If the matrix used to construct the preconditioner is a MATNORMAL or MATNORMALHERMITIAN matrix, then the QR is performed on the inner matrix to provide the preconditioner.

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(), KSPLSQR

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