KSPBCGSLSetXRes

Sets the parameter governing when exact residuals will be used instead of computed residuals.

Synopsis

#include "petscksp.h" 
PetscErrorCode KSPBCGSLSetXRes(KSP ksp, PetscReal delta)

Logically Collective

Input Parameters

• ksp - iterative context of type KSPBCGSL

• delta - computed residuals are used alone when delta is not positive

Options Database Key

• -ksp_bcgsl_xres delta - Threshold used to decide when to refresh computed residuals

See Also

KSP: Linear System Solvers, KSPBCGSLSetEll(), KSPBCGSLSetPol(), KSP, KSPCBGSL, KSPBCGSLSetUsePseudoinverse()

Level

intermediate

Location

src/ksp/ksp/impls/bcgsl/bcgsl.c

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