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# KSP_NORM_NONE

Do not compute a norm during the Krylov process. This will possibly save some computation but means the convergence test cannot be based on a norm of a residual etc.

## Note

Some Krylov methods need to compute a residual norm (such as `KPSGMRES`) and then this option is ignored

## See Also

KSP: Linear System Solvers, `KSPNormType`, `KSP`, `KSPSetNormType()`, `KSP_NORM_PRECONDITIONED`, `KSP_NORM_UNPRECONDITIONED`, `KSP_NORM_NATURAL`

## Level

advanced

## Location

include/petscksp.h

## Examples

src/ksp/ksp/tutorials/ex71.c

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