**petsc-3.15.0 2021-04-05**

# 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 GMRES) and then this option is ignored

### See Also

KSPNormType, KSPSetNormType(), KSP_NORM_PRECONDITIONED, KSP_NORM_UNPRECONDITIONED, KSP_NORM_NATURAL

### Level

advanced

### Location

src/ksp/ksp/guess/../../../../include/petscksp.h
### Examples

src/ksp/ksp/tutorials/ex71.c.html

Index of all KSP routines

Table of Contents for all manual pages

Index of all manual pages