[rrd-developers] Re: New DEF: virtual def

[Tobias Oetiker]

Today you sent me mail regarding [rrd-developers] New DEF: virtual def:

*> No, no code yet.
*> 
*> I was wondering about the resolution of the data inside a CDEF.
*> Doing functions with TIME, it will not be at the picture resolution,
*> it will be at the data resolution.

yes ...

I guess the 1.1 series will have to have a syntax for defining data density
...
in the grapher options ...


cheers
tobi
*> 
*> Try it: create a RRA with CDPs every two hours. Now use the TIME
*> function inside a CDEF and mask out every other half hour:
*> 
*> DEF:mydata=some.rrd:.....
*> CDEF:mask=TIME,3600,%,1800,LT,mydata,UNKN,IF
*> 
*> It won't work as intended, the resolution of the data is too low.
*> 
*> Perhaps we could use something like "VDEF" that carries no data in
*> it but can be used for time related stuff. It would have a resolution
*> of one calculation per pixel. I'm thinking of:
*> 
*> DEF=mydata=some.rrd....
*> VDEF:thetime=TIME
*> CDEF:mask=thetime,3600,%,1800,LT,mydata,UNKN,IF
*> 
*> Also, there would be no restriction to always use a DEF or CDEF in it
*> and the following is completely legal:
*> 
*> VDEF:constant=20
*> 
*> as opposed to
*> 
*> CDEF:constant=data,POP,20
*> 
*> 
*> Comments ?
*> 
*> Regards,
*> Alex
*> 
*> --
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*>   subject: unsubscribe to rrd-developers-request at list.ee.ethz.ch
*> 
*> 

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