wolf 方法计算李雅普诺夫指数,包括广义互相关函数GCC时延估计，二维声子晶体FDTD方法计算禁带宽度的例子。- wolf calculated Lyapunov exponent, Including the generalized cross-correlation function GCC time delay estimation, Dimensional phononic crystals FDTD method calculation examples band gap.