[rrd-users] Re: rrdtool fetch return values

[Tobias Oetiker]

Today you sent me mail regarding [rrd-users] rrdtool fetch return values:

*> When I fetch values using the following code:
*> 
*> my ($time,$step,$names,$data) = RRDs::fetch($filePath,"AVERAGE",
*>        "--start","now",
*>        "--end","now");
*> 
*> Two data points are returned:
*> 
*> Start:       Tue Mar 14 09:00:00 2000 (953020800)
*> Step size:   300 seconds
*> DS names:    ds0, ds1, ds2, ds3, ds4, ds5
*> Data points: 2
*> Tue Mar 14 09:00:00 2000 (953020800) av=6178.09084612431
*> Tue Mar 14 09:05:00 2000 (953021100) av=NaN
*> 
*> Will fetch always return an extra NaN data point? I'm thinking about future
*> versions of RRDtool. Also what about when I use other values for --start and
*> --end?
*> 
*> If the NaN is always present as the last data point , I'll just throw it away.

no only if there is No data for this point in time ... 

cheers
tobi

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