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# KSP_GMRES_CGS_REFINE_NEVER

Do the classical (unmodified) Gram-Schmidt process

## Note

Possibly unstable, but the fastest to compute

## See Also

KSP: Linear System Solvers, `KSPGMRES`, `KSPGMRESCGSRefinementType`, `KSPGMRESClassicalGramSchmidtOrthogonalization()`, `KSPGMRESSetOrthogonalization()`, `KSP`, `KSPGMRESGetOrthogonalization()`, `KSPGMRESSetCGSRefinementType()`, `KSPGMRESGetCGSRefinementType()`, `KSP_GMRES_CGS_REFINE_IFNEEDED`, `KSP_GMRES_CGS_REFINE_ALWAYS`, `KSPGMRESModifiedGramSchmidtOrthogonalization()`

## Level

advanced

## Location

include/petscksp.h

Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages