petsc-3.7.3 2016-07-24
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# KSPSetComputeRitz

Sets a flag so that the Ritz or harmonic Ritz pairs will be calculated via a Lanczos or Arnoldi process as the linear system is solved.

### Synopsis

    #include "petscksp.h"
    PetscErrorCode  KSPSetComputeRitz(KSP ksp, PetscBool flg)

Logically Collective on KSP

### Input Parameters

| ksp | - iterative context obtained from KSPCreate()
| flg | - PETSC_TRUE or PETSC_FALSE

### Notes

Currently this option is only valid for the GMRES method.

### Keywords

KSP, set, compute, ritz

### See Also

KSPComputeRitz()

Level:advanced
Location: src/ksp/ksp/interface/itfunc.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages