petsc-3.13.6 2020-09-29

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.

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

Logically Collective on ksp

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

Currently this option is only valid for the GMRES method.

advanced