问题描述：
求这段matlab代码的输出结果
N=1000
X=rand(N,1);
Xmean=sum(X)/N;
Sigma1=sqrt(sum((X-Xmean).^2)/(N+1))
Sigma2=sqrt(sum(X.^2-N*Xmean^2)/(N+1))
N=1000
X=rand(N,1);
Xmean=sum(X)/N;
Sigma1=sqrt(sum((X-Xmean).^2)/(N+1))
Sigma2=sqrt(sum(X.^2-N*Xmean^2)/(N+1))
问题解答：
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