How to plot a normalised cumulative histogram

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Riti Patel
Riti Patel 2015-4-24
评论： Brendan Hamm 2015-4-28
I've got a vector of data of length around 5000000. I'm trying to plot a cumulative histogram of this data. I've previously plotted a normalised histogram using the trapz command:
[f,z]=hist(CharPoly,1000000);
bar(z,f/trapz(z,f))
where CharPoly is the data vector. That worked fine but I'm now looking to plot a cumulative histogram from this data and I can't figure out how to incorporate either cumsum or cumtrapz into this.
Thanks!

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Brendan Hamm
Brendan Hamm 2015-4-24
编辑：Brendan Hamm 2015-4-24
If using 2014b or higher you can use the histogram command:
histogram(CharPoly,'Normalization','cdf')
If prior to 2014b use hist and bar:
[f,z]=hist(CharPoly,1000000);
% Make pdf by normalizing counts
% Divide by the total counts and the bin width to make area under curve 1.
fNorm = f/(sum(f)*(z(2)-z(1)));
% cdf is no cumulative sum
fCDF = cumsum(fNorm);
bar(z,fCDF) % display
This is done from my head, but I believe this is correct.
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