[rrd-developers] Re: [rrd-users] Re: Image clipping/stacking want

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Tue Mar 6 10:57:02 MET 2001

Sasha Mikheev wrote:

> Let me add another vote for separating data processing and retrival from
> graphing. It would be very nice to get tabular data for complex graphs in
> rrdtool fetch.

This would be nice, but we need to make sure the input is suitable for
rrdtool graph.  If the DEF command works on other datasources than RRDs,
one side of this is done.  The other side would be writing out processed
data not to a graph but as text, like PRINT but now the complete series.

> Also my favorite features would be:
> 1. Pluggable modules for RPN operations.

Something like:
usr(x) --->


> 2. Aggregate operations such as average, percentile etc in CDEF and PRINT
> It should work like this:
> foo=CDEF:bar,95,PECENTILE
> now bar will be a constant series and you will be able to graph it.

This is *very* similar to the stuff I'm currently working on.  It will
use variables which you can use in CDEF instructions something like:
LINE1:perc#FF0000:"95th percentile"

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