# KSPBCGSLSetXRes

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

### Synopsis

    PetscErrorCode PETSCKSP_DLLEXPORT KSPBCGSLSetXRes(KSP ksp, PetscReal delta)

Collective on KSP

### Input Parameters

| ksp | - iterative context obtained from KSPCreate
| delta | - computed residuals are used alone when delta is not positive

### Options Database Keys

-ksp_bcgsl_xres delta -

### Keywords

KSP, BiCGStab(L), set, exact residuals

### See Also

KSPBCGSLSetEll(), KSPBCGSLSetPol()

Level:intermediate
Location:src/ksp/ksp/impls/bcgsl/bcgsl.c
Index of all KSP routines
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Index of all manual pages