非线性动力学、分岔 Matlab 程序实现，绘出系统状态变量随参数变化分岔图，绘图参数对应的系统各周期及混沌状态的时间历程图、相轨迹图、Poincare映射图(Nonlinear dynamics and bifurcation are realized by MATLAB program. The bifurcation diagram of system state variable with parameter variation is drawn. The time history diagram, phase trajectory diagram and Poincare map of each period and chaos state corresponding to system parameters are drawn.)