Method J

python/test/unit/nls/test_newton.py:51–57

Assemble Jacobian matrix.

(self, x, A)

        set_bc(b, [self.bc], x, -1.0)

    def J(self, x, A):
        """Assemble Jacobian matrix."""
        from dolfinx.fem.petsc import assemble_matrix

        A.zeroEntries()
        assemble_matrix(A, self.a, bcs=[self.bc])
        A.assemble()

    def matrix(self):
        """Create a PETSc matrix for the problem."""