[R] Re: coding factor replicates

[Uwe Ligges]

Brad Buchsbaum wrote:
> 
> Hi All,
> 
> If I have a factor f:
> 
> A B C B C A C B A A B ....
> 
> and I would like to generate a factor to indicate the trial number
> as a function of condition: e.g.
> 
> 1 1 1 2 2 2 3 3 3 4 4 ...
> 
> how might I attack this in R?

What about something like
  as.factor(outer(rep(1, 3), 1:4))

Uwe
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