[rrd-users] Re: PREV-Function? SUM-CF ?

[Rene Fritzsche]

Hi.

> > So what i really need is a function to integrate the
> > function of received energy.
[...]
> > DEF:Ls=Light.rrd:D1:AVERAGE
> > CDEF:E=PREV,Ls,60,*,+
> > LINE:E#FF0000
> > 
> > but it wont work .. E is allways 0 or not defined
[...]
> There are two different PREV functions.  I think you need
> the other one.

Ok.. i changed the lines above to:
 DEF:Ls=Light.rrd:D1:AVERAGE
 CDEF:E=PREV(E),Ls,60,*,+
 LINE:E#FF0000

[i think you meant the PREV(vname)-function described on
the manual-pages..]
But after doing that, rrdtool fails with:
"ERROR: invalid rpn expression in: PREV(E),Ls,60,*,+"

PREV(Ls) ... using it with a DEF'ed dataset works fine,
but not with a CDEF'ed vname... kind of confusing when
reading the webpage. Maybe its a bug ?

My problem still remains .. :(


Cu Rene.

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