Question
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.
Expert Answer
Kshitij Singh
PhD Expert
Answered Aug 24, 2026
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 .
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