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From Ted Dunning <>
Subject Re: Clustering Data
Date Wed, 17 Aug 2011 14:29:55 GMT
I don't think that you need a solver for this.  Just compute the smoothed
derivatives at all points and then extract features from the rank statistics
of the ensemble of all values.

On Wed, Aug 17, 2011 at 12:13 AM, Alexander Kerner <> wrote:

> Yes, feature extraction is exactly the point.
> First and second derivates is the approach I'm on right now. Do you now a
> library to calculate the roots of the derivates?
> I found apache.commons.math do do something like this, but documentation
> how to use the solvers is quite poor.

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