[rrd-users] no NaN values in perl?

[Karl Fischer]

cool! many thanx!

BTW: is this a top-posting list?

Rgds

- Karl


Tobias Oetiker wrote:
> Hi Karl,
> 
> In RRDs, NaN is represented as undef. So you can test:
> 
> 
>   if (not defined $value){
>         print "Nan"
>   } else {
>         print $value
>   }
> 
> cheers
> tobi
> 
> 
> Yesterday Karl Fischer wrote:
> 
>> Hello all,
>>
>> I'm new to this list and fairly new to using rrdtool.
>>
>> I found it quite useful to be able to store undefined 'NaN'
>> values beneath numeric values in the rrd ...
>> (eg. to differentiate between system offline and 0-value)
>>
>> Works great when using rrdtool as a standalone, however, when
>> using RRDs::fetch in perl, all NaN values get converted into
>> '0' when fetching values from the RRDB.
>>
>> Why? Am I doing anything wrong?
>>
>> I've tried to search the archives for hints and found many
>> people complaining about NaN - however, I do want to get them.
>>
>> My apologies if this has been asked before - please point me
>> to some documentation about this - if there's any.
>>
>> Many thanks for your help.
>>
>> Rgds
>>
>> - Karl