SNESCreate

Creates a nonlinear solver context.

Synopsis

#include "petscsnes.h"  
int SNESCreate(MPI_Comm comm,SNESProblemType type,SNES *outsnes)
Collective on MPI_Comm

Input Parameters

comm - MPI communicator
type - type of method, either SNES_NONLINEAR_EQUATIONS (for systems of nonlinear equations) or SNES_UNCONSTRAINED_MINIMIZATION (for unconstrained minimization)

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(), SNESProblemType, 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/ex1f.F.html
src/snes/examples/tutorials/ex5f.F.html
src/snes/examples/tutorials/ex5f90.F.html