Hi,
2017-02-14 19:44 GMT+01:00 SolarMan <h...@vega.demon.nl>: > 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. > Regards, > hans > Thank you Hans for your quick response. I understand the documentation is wrong then. Any idea how to easily create a DEF with 0 value all along ? I'm using it in a automatized script that write the whole 'rrdtool graph' line, and when original DEF file is not present, I would like to replace it with 0 to keep the same logic. Olivier
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