How to put X-axis into a variable related to the sweeping variable rather than the sweeping variable itself (by default) in the Cadence Waveform?

Hi All,

I have a question related to Cadence waveform....After i do the DC sweep simulation, I want to plot 

gm/id VS id/(w/l)

Eg: If i sweep W (width) of a device and now i only can plot gm/Id vs W in a straightforward way as the W is the sweeping variable default set as the X-axis.

When w changes, the id changes. So what I want is like sweeping w, rather putting it(w) directly into X-axis, put a function [ f(w)=id/(w/l) ] into X-axis (no bother to Y-axis).

Any suggestions??

regards,

Alex.