# KSPGetDiagonalScaleFix

Determines if KSP diagonally scales the system back after solving.
### Synopsis

#include "petscksp.h"
PetscErrorCode PETSCKSP_DLLEXPORT KSPGetDiagonalScaleFix(KSP ksp,PetscTruth *fix)

Collective on KSP

### Input Parameter

**ksp ** -the KSP context

### Output Parameter

**fix ** -PETSC_TRUE to scale back after the system solve, PETSC_FALSE to not
rescale (default)

### Notes

Must be called after KSPSetDiagonalScale()
If PETSC_TRUE will slow things down, because it rescales the matrix before and
after each linear solve. This is intended mainly for testing to allow one
to easily get back the original system to make sure the solution computed is
accurate enough.

This routine is only used if the matrix and preconditioner matrix are
the same thing.

### Keywords

KSP, set, options, prefix, database

### See Also

KSPGetDiagonalScale(), KSPSetDiagonalScale(), KSPSetDiagonalScaleFix()

**Level:**intermediate

Location:src/ksp/ksp/interface/itfunc.c

Index of all KSP routines

Table of Contents for all manual pages

Index of all manual pages