# KSP_NORM_PRECONDITIONED
Compute the norm of the preconditioned residual B*(b - A*x), if left preconditioning, and pass that to the convergence test routine. 


## See Also
 `KSPNormType`, `KSPSetNormType()`, `KSP_NORM_NONE`, `KSP_NORM_UNPRECONDITIONED`, `KSP_NORM_NATURAL`, `KSPSetConvergenceTest()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscksp.h.html#KSP_NORM_PRECONDITIONED">include/petscksp.h</A>


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[Index of all KSP routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
