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[Denis Zhdanov <question258925@xxxxxxxxxxxxxxxxxxxxx>]

Question #258925 on Graphite changed:
https://answers.launchpad.net/graphite/+question/258925

Denis Zhdanov posted a new comment:
Hi Jens,

Usually you are need to use sumSeries(nonNegativeDerivative()) instead
of vice versa - but main reason behind it is spikes - see
http://www.jilles.net/perma/2013/08/22/how-to-do-graphite-derivatives-
correctly/ for details. If you have no gaps in graphs both of them will
work fine.

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