计算中立型方程用matlab自带函数sol = ddensd(ddefun,dely,delyp,history,tspan,options)，想请教中立型微分方程的功率谱图，分岔图，lyapunov指数图
http://wenku.baidu.com/link?url=g_yydwLXElcju09kV9xADMxjjYp6bz7qwq2t2oyPji_eYt6VvHa_9meWTmVTfP4axWAPhvKyVfdy4wl31zo1bOmBDyteZI-vjvctQNZKLLO