[rrd-users] Re: how to fill with previous value when graph

[Dan McGinn-Combs]

Last time I tried to use a recursive value like that, it didn't work. I
think you want the other "value" to be separate previously defined,
right?

DEF:count=counter.rrd:DS0:AVERAGE
CDEF:value=count,UN,0,count,IF

One other option is to set the XFILES very high so that you are
virtually assured of having SOME reading. It is by convention set to .5
so that if half the returned readings are NaN, they are stored as NaN.
By setting it to .99, it will always store some reading, not matter how
small.

You might check the following URL to see some examples of the RPL
language. I found the exceptionally hepful:

http://www.rrdtool.com/tutorial/rpntutorial.html
http://www.rrdtool.com/tutorial/cdeftutorial.html

Dan

-----Original Message-----
From: Dexin Wang [mailto:dexin at rtda.com] 
Sent: Wednesday, May 14, 2003 6:52 PM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] how to fill with previous value when graph


I have some NaN value on some PDP. When creating the graph, I know I can

do this:

CDEF:value=value,UN,0,value,IF

to set the value to 0 if it is NaN. Is it possible that whenever I find 
a NaN, I use the value of the previous non-NaN PDP? Basically can I 
store value in a variable and use it? Or some other way? Please help.

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