[rrd-users] Re: moving averages?

[Serge Maandag]

I haven't used the PREV function yet, but I imagine you could do
something like this:

DEF:val=....
CDEF:avg=val,PREV,+,2,/

to make a moving average of the last 2 samples.
Perhaps you can say PREV(<no of steps back>) ?

Than you could do:

avg=val,PREV(1),+,PREV(2),PREV(3),+,.....,60,/

but as I mentioned: I never looked at it.

serge.

-----Original Message-----
From: Eduardo Diaz Comellas [mailto:ediaz at ultreia.es] 
Sent: Thursday, April 03, 2003 11:13 PM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] moving averages?


Hi!

I've been searching the way of doing a moving average with rrdtool. Is
there any simple way of doing this? I need the moving average of the
last 60 time steps and have it graphed beneath the "real time" values...

I've seen the PREV operator, but I can't imagine how to use it to get
the moving average of the last 60 time steps... :-(

Regards.
-- 
Eduardo Diaz Comellas <ediaz at ultreia.es>
Ultreia Comunicaciones S.L.

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