petsc-3.14.5 2021-03-03
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# KSPGetDiagonalScaleFix

Determines if KSP diagonally scales the system back after solving.

### Synopsis

    #include "petscksp.h"
    #include "petscmat.h"
    PetscErrorCode  KSPGetDiagonalScaleFix(KSP ksp,PetscBool  *fix)

Not Collective

### 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.

### See Also

KSPGetDiagonalScale(), KSPSetDiagonalScale(), KSPSetDiagonalScaleFix(), KSP

### 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