petsc-3.4.5 2014-06-29

SNESJacobianFunction

function used to convey the nonlinear Jacobian of the function to be solved by SNES

#include "petscsnes.h"
$     SNESJacobianFunction(SNES snes,Vec x,Mat *Amat,Mat *Pmat,int *flag,void *ctx);

	x	- input vector
	Amat	- the matrix that defines the (approximate) Jacobian
	Pmat	- the matrix to be used in constructing the preconditioner, usually the same as Amat.
	flag	- flag indicating information about the preconditioner matrix structure (same as flag in KSPSetOperators()), one of SAME_NONZERO_PATTERN,DIFFERENT_NONZERO_PATTERN,SAME_PRECONDITIONER
	ctx	- [optional] user-defined Jacobian context