[R] Combining factors

[Rainer M Krug]

Hi

I know this is a basic question and I know I have done it before but I 
can't find the answer any more.

I have a data set, say:

F1, F2, Value

F1 and F2 are Factors.

I would like to plot

plot(TheCombinationOf(F1, F2), Value)

I remember there was a function for TheCombinationOf() but I don't 
remember the name.

I could create a new factor based on F1 and F2, but I would prefer the 
other soluytion.

Any help welcome,

Rainer


-- 
Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation
Biology (UCT)

Department of Conservation Ecology and Entomology
University of Stellenbosch
Matieland 7602
South Africa

Tel:		+27 - (0)72 808 2975 (w)
Fax:		+27 - (0)21 808 3304
Cell:		+27 - (0)83 9479 042

email:	RKrug at sun.ac.za
       	Rainer at krugs.de