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# 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

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

## Level

advanced

## Location

include/petscksp.h

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