Graphite’s Derivative Function

Struggled with this for a day since it looked like we weren’t able to get the correct values from Graphite’s derivative and nonNegativeDerivative functions.

Found this blog that explains it pretty clearly.

Switched to perSecond() and using Graphite’s 0.9.10 it fails with an exception message. I’ve explained the problem at Graphite’s launchpad..

I think perSecond deserves its own post so to be continued…

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