说明：  非线性动力系统中分叉图用来定性的表示系统行为的演化，本代码中ode1.m定义了一个经典的Lorenz系统，sode3.m对该系统计算并画出了参数敏感区的分叉图。
(Nonlinear dynamic system bifurcation diagram used to express qualitative evolution of system behavior, the code defines a ode1.m classical Lorenz system, sode3.m of the system to calculate and draw the sensitive areas of the bifurcation parameter Fig.)