function y=ruili(m,n)
%瑞利分布,m是瑞利分布的參數,n代表數據量,n一般要大于1024
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x=junyun(n);
for i=1:n
    if (x(i)==0)
        x(i)=0.0001;
    else 
        continue;
    end
end    
u=(-2)*log(x);
y=m*sqrt(u);