def process_coeff(self, coeff): epsilon = coeff['epsilon']; sigma = coeff['sigma']; alpha = coeff['alpha']; lj1 = 4.0 * epsilon * math.pow(sigma, 12.0); lj2 = alpha * 4.0 * epsilon * math.pow(sigma, 6.0); return _md.make_wall_lj_params(_hoomd.make_scalar2(lj1, lj2), coeff['r_cut']*coeff['r_cut'], coeff['r_extrap']);