I derived a data set with sampling frequency 16384 and want to interpolate it with a cspline. I want to do so in order to find the true local maxima and minima of the data, not the discretized visible ones. However I do not know how to start e.g. root-finding algorithms on the derivative of the cspline over a small stretch of data as these methods require explicit C-functions, which I cannot provide. How to proceed?

Alex


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