[rrd-users] Detecting and handling unknown data

[John huysing]

After look at the CDEF tutorial

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

and reading the section on handling unknown data

I thought I would try this to see if I could detect if had unknown data in
a rrd, so i could process it differently

If its unknown set the value to 10 else set to 0

CDEF:wrong=currTot,UN,10,0,IF

VDEF:Wrong=wrong,MAXIMUM

VDEF:AWrong=wrong,AVERAGE

PRINT:Wrong:%5.2lf            ----> returns inf

PRINT:AWrong:%5.2lf           ----> returns a value

The 2nd problem is when I try this
PRINT:AWrong:%c:strftime

I always get the start of unix time ....1970


John
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