#include "petscsnes.h" PetscErrorCode SNESCreate(MPI_Comm comm,SNES *outsnes)Collective on MPI_Comm
| -snes_mf | - Activates default matrix-free Jacobian-vector products, and no preconditioning matrix | |
| -snes_mf_operator | - Activates default matrix-free Jacobian-vector products, and a user-provided preconditioning matrix as set by SNESSetJacobian() | |
| -snes_fd | - Uses (slow!) finite differences to compute Jacobian |
Developer Notes: SNES always creates a KSP object even though many SNES methods do not use it. This is unfortunate and should be fixed at some point. The flag snes->usesksp indicates if the particular method does use KSP and regulates if the information about the KSP is printed in SNESView(). TSSetFromOptions() does call SNESSetFromOptions() which can lead to users being confused by help messages about meaningless SNES options.
SNES always creates the snes->kspconvctx even though it is used by only one type. This should be fixed.
Level:beginner
Location:src/snes/interface/snes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages