def METHOD_NAME(self):
    # fd/cs step size
    if TACS.dtype is complex:
        self.dh = 1e-200
        self.rtol = 1e-11
    else:
        self.dh = 1e-8
        self.rtol = 1e-4
    self.dtype = TACS.dtype
    self.atol = np.clip(1e-5 * self.rtol, 1e-14, 1e-8)
    self.print_level = 0
    # Set element index
    self.elem_index = 0
    # Set the variable arrays
    self.x = np.ones(3, dtype=self.dtype)
    self.pt = np.zeros(3)
    self.dvs = np.array([1.0], dtype=self.dtype)
    # Create the isotropic material
    rho = 2700.0
    specific_heat = 921.096
    E = 70e3
    nu = 0.3
    ys = 270.0
    cte = 24.0e-6
    kappa = 230.0
    self.props = constitutive.MaterialProperties(
        rho=rho,
        specific_heat=specific_heat,
        E=E,
        nu=nu,
        ys=ys,
        cte=cte,
        kappa=kappa,
    )
    # Create stiffness (need class)
    self.con = constitutive.SolidConstitutive(self.props, t=1.0, tNum=0)
    # Seed random number generator in tacs for consistent test results
    elements.SeedRandomGenerator(0)