程序\coeffkeji.m ....\difference equation.m ....\GMg(t)yuce.m ....\GMg(t)yucejianyan.m ....\GNPcurvefit.cfit ....\juleifenxi.fig ....\logistic_changzhurenkou.asv ....\logistic_changzhurenkou.m ....\logistic_hujirenkou.m ....\TFRcurvefit.cfit 程序