KSPGMRESModifiedGramSchmidtOrthogonalization#

This is the basic orthogonalization routine using modified Gram-Schmidt.

Synopsis#

PetscErrorCode KSPGMRESModifiedGramSchmidtOrthogonalization(KSP ksp, PetscInt it)

Collective

Input Parameters#

  • ksp - KSP object, must be associated with KSPGMRES, KSPFGMRES, or KSPLGMRES Krylov method

  • its - one less then the current GMRES restart iteration, i.e. the size of the Krylov space

Options Database Keys#

Notes#

In general this is much slower than KSPGMRESClassicalGramSchmidtOrthogonalization() but has better stability properties.

See Also#

KSP: Linear System Solvers, KSPGMRESSetOrthogonalization(), KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESGetOrthogonalization()

Level#

intermediate

Location#

src/ksp/ksp/impls/gmres/borthog.c

Examples#

src/ksp/ksp/tutorials/ex5f.F90

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