[rrd-users] CDEF 0 in rrdtool graph

SolarMan hans at vega.demon.nl
Tue Feb 14 19:44:31 CET 2017

Hello Olivier,
The error message is confusing and should actually read: 
rrdtool.OperationalError: rpn expressions without DEF or CDEF variables are
not supported
as it does in other cases.
The meaning is clear: you must use a DEF or CDEF in your CDEF definition.

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