[rrd-users] NAN and 0 in aggregate graphs
Adam Jacob Muller
rrdtool-users at adam.gs
Mon Mar 31 04:00:52 CEST 2008
I have an application utilizing rrdtool where it is in some cases
useful to produce "aggregate" graphs of information, this works great
in rrdtool by just doing a CDEF=somefield_aggregate=field1,field2,+
the only problem I experience here is when field1 or field2 are NAN,
obviously when field1 and field2 are NAN the proper result is NAN, but
if field1 is NAN and field2 is some positive value than the result
should be field2's value.
Right now I am solving this by doing something like:
this works, but, on values where both are NAN this returns 0, it would
be much more preferable to return NAN here
Any ideas how to do this.
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