PDF/CDF 用matlab计算和绘图1_matlab cumsum函数用法 cdf

需要一点something new ，虽说PDF/CDF也不new，但还是先加着吧，我需要图的横坐标是非等间距的，例如下图

matlab的工具箱里自带工具（见下图红框），尝试了一下，出图的横坐标是等间距的，尝试更改，但是出了问题，所以还是算出来用origin画吧

代码以下

CDF:

c=[0.05 0.55 1.5 3.5 7.5 15 35 75];

N=hist(x,c);

cdf1=cumsum(N)/sum(N);

PDF:

c=[0.05 0.55 1.5 3.5 7.5 15 35 75];

[N,X]=hist(x,c);

N1=N./sum(N);

然后用origin画一下就行了。。

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