# SNESCreate

Creates a nonlinear solver context.

### Synopsis

    #include "petscsnes.h"
    PetscErrorCode PETSCSNES_DLLEXPORT SNESCreate(MPI_Comm comm,SNES *outsnes)

Collective on MPI_Comm

### Input Parameters

| comm | - MPI communicator

### Output Parameter

| outsnes | - the new SNES context

### Options Database Keys

| -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

### Keywords

SNES, nonlinear, create, context

### See Also

SNESSolve(), SNESDestroy(), SNES

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

### Examples

src/snes/examples/tutorials/ex1.c.html
src/snes/examples/tutorials/ex2.c.html
src/snes/examples/tutorials/ex3.c.html
src/snes/examples/tutorials/ex5.c.html
src/snes/examples/tutorials/ex5s.c.html
src/snes/examples/tutorials/ex6.c.html
src/snes/examples/tutorials/ex14.c.html
src/snes/examples/tutorials/ex21.c.html
src/snes/examples/tutorials/ex26.c.html
src/snes/examples/tutorials/ex1f.F.html
src/snes/examples/tutorials/ex5f.F.html