KSPSetInitialGuessNonzero#

Tells the iterative solver that the initial guess is nonzero; otherwise KSP assumes the initial guess is to be zero (and thus zeros it out before solving).

Synopsis#

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

Logically Collective

Input Parameters#

Options Database Key#

  • -ksp_initial_guess_nonzero <true,false> - use nonzero initial guess

Note#

If this is not called the X vector is zeroed in the call to KSPSolve().

See Also#

KSP: Linear System Solvers, KSPGetInitialGuessNonzero(), KSPGuessSetType(), KSPGuessType, KSP

Level#

beginner

Location#

src/ksp/ksp/interface/itfunc.c

Examples#

src/tao/pde_constrained/tutorials/parabolic.c
src/ksp/pc/tutorials/ex1.c
src/ksp/ksp/tutorials/ex3.c
src/ksp/ksp/tutorials/ex71.c
src/ksp/ksp/tutorials/ex84.c
src/ksp/pc/tutorials/ex2.c
src/ksp/ksp/tutorials/ex27.c
src/ksp/ksp/tutorials/ex9.c
src/ksp/ksp/tutorials/ex72.c
src/ksp/ksp/tutorials/ex56.c


Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages