[rrd-users] Sup-Sample Aggregate Functions?

Hi All!

I was curious as to if it was possible to create a graph that contains a
sub-sample aggregate. What I am trying to do is basically smooth out a
series of points to produce a sort of trend. This actually works well
but the problem is that I am using a step-size of 2 seconds and am only
recording data for a short period of time (a few minutes). As a result,
the graphs look very blocky since you can see jaggedness. Here are some
examples:

http://www.moocowproductions.org/temp/questions.png

You can see the Trend (using HWPREDICT here) and the Average (using the
TREND VDEF) come close, but I really want a spline-based smoothing or
something along those lines.

Something, for instance, similar to this:

http://graphpite.sourceforge.net/sam....php?sample=03

Really, I don't care about the actual datapoints. I care about making a
smooth looking graph that is an estimate of the actual datapoints. I
checked #rrdtool and was told it was not possible with the standard
version of rrdtool. Anyone have any ideas on how I could augment rrdtool
for this or had another suggestion on what I could use?

Thanks!

Tim S.

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