请问如何根据积分值求积分上限。
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现有一个函数x=[randn(30,1);5+randn(30,1)];[f,xi]=ksdensity(x);
figure()
subplot(211);
plot(x);
title('样本数据(Sample Data)');
subplot(212);
plot(xi,f);
title('概率密度分布(PDF)');
现在已经知道了概率密度分布曲线,我想求累计概率值为0.8的那个点,请问如何求,谢谢大神指点。
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