petsc-3.12.4 2020-02-04
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# KSPCheckNorm

Checks if the result of a norm used by the corresponding KSP contains Inf or NaN. These indicate that the previous application of the preconditioner generated an error Collective on ksp

### Input Parameter

ksp -the linear solver (KSP) context.

### Output Parameter

beta -the result of the norm

### Developer Note

this is used to manage returning from KSP solvers whose preconditioners have failed in some way

### See Also

KSPCreate(), KSPSetType(), KSP, KSPCheckDot(), KSPCheckSolve()

### Level

developer

### Location

include/petsc/private/kspimpl.h
Index of all Sys routines
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Index of all manual pages