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

Alex van den Bogaerdt alex at ergens.op.het.net
Sun Sep 24 18:29:24 MEST 2006

On Sun, Sep 24, 2006 at 06:14:18PM +0200, Rene Fritzsche wrote:

> So what i really need is a function to integrate the
> function of received energy.
> Here is what i tried to do to build the sum of all
> values of the past: [using rrdtool graph]
> 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 [i dont
> see any line]. i think the PREV-Function isnt working for
> non "DEF-Values"..inconsistent with the manual-page.

There are two different PREV functions.  I think you need
the other one.

Alex van den Bogaerdt

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