此程序代码用于求解方程Xn+1=r*Xn(1 -Xn)，其中X0为0——1之间的随机数，r的范围1——4；r取

不同的值是可计算得不同的Xn，据此得出Logistic Map图。-This program code is used to solve the equation Xn+1 = r* Xn (1-Xn), where X0 is 0- 1 random number between, r the range 1- 4　r take a different value is computable too Different Xn, accordingly drawn Logistic Map figure.