function?test
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%?研究不同R和初始值x對周期的影響，橫坐標是R的變化值，縱坐標是X（t）的變化值
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R=input（‘R=??‘）;????%給定R的初始值，觀察不同的R，對周期的變化
x1=input（‘x1=??‘）;????%蟲口方程對初始值很敏感，給定不同的初始值
x2=input（‘x2=??‘）;????%蟲口方程對初始值很敏感，給定不同的初始值
%x=0.001;
hold?on;
a=zeros（1100）;
b=zeros（1100）;
???i=1;
???while?x1<=1;
????if?i==101???%?判斷x是否等于1，是跳出while循環，否就需執行
????????break;
????else
????????dx1=R.*（1-x1）.*x1;
????????x1=dx1;
?????