Sorry to answer my own post, but it may help some other searching soul. On Thu, Mar 10, 2011 at 8:44 AM, Chris Nighswonger < [email protected]> wrote:
> I'm wondering if this is possible with rrdtool: > > I have a sensor which is logged once every 30 seconds. > > I would like to produce a graph on which each point represents a 15 min > average of the sampled data. > > Here is the caveat: The graph should have as many points as there are 30 > second data points with each point representing the average of the previous > 15 minutes worth of data points. So a sort of "running average" if you will. > > This is called a Moving Average in statistics. ( http://en.wikipedia.org/wiki/Moving_average) > I'm guessing some DEF or CDEF magic will be needed to do this.... but I'm > no statistics guru. :-) > The magic is already there with the RPN notation 'TREND' and 'TRENDNAN.' ( http://oss.oetiker.ch/rrdtool/doc/rrdgraph_rpn.en.html#Set%20Operations) Kudos to the devs for this super tool! Kind Regards, Chris
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