[rrd-users] problems with prev

[itris]

Hi all,

I've spent some time with RRD and am fairly comfertable with it. One thing I
was trying lately was making some kind of counter, counting the nr of times
data in an rrd would be unknown.
so that would be like:
CDEF:nrunknown=PREV,UN,currentvalue,+
or even
CDEF:nrunknown=currentvalue,0,LE,PREV,UN,+

right?
So why doesn't this work..

the real live graph I'm using and trying to get to show (with an ever
increasing line) the unknown data's:

rrdtool graph $grafixdir$in{'pingid'}-uur$in{'logaritmisch'}.png
$in{'logaritmisch'} -z -a PNG --start -3600 --end -15 --width 600
DEF:RTTavg=$pingrrd:pingtime:AVERAGE
CDEF:fast=RTTavg,0,LE,INF,0,IF
AREA:fast#000000:"lost packet"
LINE1:RTTavg#0000FF:"RTT, one sample every 6 seconds"
CDEF:pl=RTTavg,0,LE,PREV,1,+,PREV,IF
GPRINT:pl:MAX:"pl %lf"
LINE3:pl#FFFF00:pl

pl always returns NaN :(

can anyone help me out here, or is PREV bugged?

thanks,


Itris


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