petsc-3.12.5 2020-03-29

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.

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