Need to derive the CDF for a function using Matlab
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Walter Roberson on 24 Jan 2012
cdf requires a probability density function, which you do not appear to provide.
Your signal looks to me as if it is a subselection from a larger signal; if so then it would be improper to attempt to estimate a PDF. If your signal is intended to be defined strictly over that interval and 0 elsewhere, then at least in theory you should have some Heaviside step functions.