I figured this out. Incase anyone else needs to know, its done by the following 
code in custom graph definition:

Code Begin [
CDEF:CurrentIveNCHits=iveNCHits-raw
CDEF:LastIveNCHits=PREV(CurrentIveNCHits)
CDEF:PrevIveNCHits=PREV(LastIveNCHits)
CDEF:DiffIveNCHits=CurrentIveNCHits,PrevIveNCHits,-,0.001,+
] End

This results in the difference between the two samples (this last and the 
previous) and adds 0.001 to avoid a negative 0.00 (unknown why it happens).

This is useful for taking a counter total and determining the count per second, 
etc.




-------------------- m2f --------------------

Read this topic online here:
http://forums.zenoss.com/viewtopic.php?p=37466#37466

-------------------- m2f --------------------



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