PETSc version 3.17.5

DMSNESCreateJacobianMF

Create a Mat which computes the action of the Jacobian matrix-free

#include "petscdmplex.h" 
#include "petscsnes.h"   
PetscErrorCode DMSNESCreateJacobianMF(DM dm, Vec X, void *user, Mat *J)

Collective on dm

	dm	- The DM
	X	- The evaluation point for the Jacobian
	user	- A user context, or NULL

- The Mat

Vec X is kept in Mat J, so updating X then updates the evaluation point.

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