Complex CDEFs, not possible with cacti?

[bmeshier]

I'm trying to create a graph similar to:
http://people.ee.ethz.ch/~oetiker/webto ... on-01.html

After playing around in cacti with no luck, I'm thinking such a graph is not possible because of some limitations with cacti. I need to be able to create CDEFs that use two sources, such as:


CDEF:cdef=cpu,0,10,LIMIT,UN,UNKN,load,IF

Where it does a limit on 'cpu' and returns 'load'

Any thoughts?