[rrd-users] rpn to convert NaN to 0

[Mark Hedges]

I think Alex is meaning this tutorial:

http://oss.oetiker.ch/rrdtool/tut/cdeftutorial.en.html

There are examples on that (around the middle of the page).

I'm not sure why you are now getting nothing graphed. I would only use
the IF/UN RPN statement on the value you know that could be NaN and
just customise it as you see fit.

I recently had to use this method to some across more than 100
different values, any of which could have been NaNs - produced a very
lengthy RPN expression.

--
Mark

2009/3/14 R Dicaire <kritek at gmail.com>:
> On Sat, Mar 14, 2009 at 2:44 PM,  <parkamark at gmail.com> wrote:
>> CDEF:ices=icecast,UN,0,icecast,IF,vicecast,UN,0,vicecast,IF,+
>
> Hi Mark, while this one doesn't error when creating the graph, the
> result isn't graphed.
> icecast will always return a num since its always running, vicecast is
> the one that that may return NaN.
> If I read your CDEF correctly, UN is the NaN? And reads as if vicecast
> is UN then set to 0?
> What purpose does iterating icecast and vicecast a second time in the
> statement achieve?
>
>
> Alex, if you're referring to
>
> http://oss.oetiker.ch/rrdtool/tut/rpntutorial.en.html, there's no
> mention of converting NaN to 0, the tutorial assumes all values are
> valid, but thanks.
>
>
> --
> aRDy Music and Rick Dicaire present:
> http://www.ardynet.com
> http://www.ardynet.com:9000/ardymusic.ogg.m3u
>