[ferret_users] problem with two data sets

[aleksi.nummelin@xxxxxxxxxxxxxxx]

Hi!
How can I multiply with two variables from different data 
sets?

Example: U*V , when U is from data set 1 and V from data 
set 2.

Now Ferret  regognizes only variable from default data 
set, so how would it regognize both?

Thanks!

 Aleksi Nummelin