[rrd-developers] Fwd: Can CDEF be made to compute averages from 2 different data sources ?

[Eric Ho]

Hi,
 
I've 2 different data sources from 2 separate RRD files.
Both heartbeats are the same, and the 'step' for both RRD files are the same.
 
Is it possible to write a CDEF to compute the average of some of the
samples from these 2 data sources and then graph this average value ?
By 'some samples', I mean samples from a certain period of time
in the past.
 
By looking at the manpages of 'rrdtool graph', I can't see how 
this can be done via CDEF...  or am I misusing CDEF or missing
the point of CDEF ?
 
 

Note: forwarded message attached.



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