[rrd-users] Re: interpolation algo?

Ford, Andy andyford at AGEDWARDS.com
Wed Mar 1 00:18:07 MET 2006

> -----Original Message-----
> From: Serge Maandag [mailto:serge.maandag at staff.zeelandnet.nl]
> Sent: Tuesday, February 28, 2006 4:57 PM
> To: Ford, Andy; rrd-users at list.ee.ethz.ch
> Subject: RE: [rrd-users] interpolation algo?
> > Does anyone have handy a detailed description of, or the name 
> > of the data interpolation algorithm in rrdtool?
> There are multiple interpolations.
> If you update more than once in a PDP, the weighted average is
> taken, iirc. The PDPs are simply averaged into a CDP if the RRA
> type is AVERAGE.

I'm looking for the data resampling part where the data gets moved & interpolated to a time boundary. 
There's section in Alex's tutorial at the end called "Data Resampling".
I want the math. I studied math through differentiable manifolds, but my statistics knowledge is very poor.

Andy Ford
A.G. Edwards & Sons Technology Group, Inc.
Enterprise Event Management
andyford at agedwards.com 

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