[rrd-users] Re: Display and all...

[Tobias Oetiker]

Today you sent me mail regarding [rrd-users] Display and all...:

*> So plotting would become a 3 tiered thing:
*> 
*> 1) Foreach point in the selected RRA (by the "best resolution"
*> criterium), we run the "first" CDEF/rpn expression, generating a
*> stream of numbers.
*> 
*> 2) If it exists, an averaging function is run over these numbers
*> from #1, averaging functions are given as a tuple (of N numbers,
*> where N is the number of values to be averaged), which specifies
*> the weight of each value to be averaged.

There is the idea of having a MASSAGE: function which would work
somewhat like this:

MDEF:x=FUNCTION:par1:par2:...:parX 
(M for Massage)

the number of parameters depends on the Function chosen. Parameters
can be numbers or variable names from DEF or CDEF functions ...

*> at a certain position onto the stack (relative to current
*> position, which is signified by the number 0), you could
*> implement running averages using the CDEF/rpn construct.

this is already possible with the PREV operator ... 


does this make sense ?

cheers
tobi

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