[rrd-users] Subtracting one RRD from another?

[Cooper Nelson]

Hi friends,

I'm working with the current development release.

Is there an easy way to graph the difference between the same time 
period on two seperate RRD's, or two seperate periods within the same 
RRD?  For example, say I kept 5 minute averages of traffic for 2 months 
and wanted to plot the difference between now and one month ago.

I'm thinking CDEF could do this, but I'm unsure how to get started. 
 Could I just create a DEF for a one week period a month ago then 
subtract that from a plain datasource DEF?

Cheers,
Cooper

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