[rrd-users] rpn to convert NaN to 0
mark at phix.me
Sat Mar 14 20:13:35 CET 2009
I think Alex is meaning this tutorial:
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.
2009/3/14 R Dicaire <kritek at gmail.com>:
> On Sat, Mar 14, 2009 at 2:44 PM, <parkamark at gmail.com> wrote:
> 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:
More information about the rrd-users