[rrd-users] the CDEF command "PREV"

[Bould, Jason Alan]

Whenever I try to write a CDEF command for the graphing utility using
"PREV", RRDTool gives the "invalid rpn expression" error.  Is there some
special usage of this parameter that I don't know?  I'm using RRDTool on
Windows NT, versions 1.0.7 and 0.99.31

Thanks,
Jason Bould
AITS - University of Illinois

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