[R] Combining factors

[Rainer M Krug]

Peter Dalgaard wrote:
> Rainer M Krug <RKrug at sun.ac.za> writes:
> 
>> 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,
> 
> F1:F2
> interaction(F1,F2)
> 
> There are some differences so lookup the help page for the latter.
> 

Thanks a lot

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