[R] 2 plots sharing axis / combining factors

[Thomas Lumley]

On Mon, 30 Sep 2002, juli g. pausas wrote:
> - How could I convert 2 factor variables in a single factor variable
> which is the combination of the other 2.
> Example:
>     lith: a factor 2 levels "ca", "ma"
>     sp: a factor with 2 levels, "ph", "qi"
> and I'd like to obtain:
>     splith: a factor with 4 levels: phma, phca, qima, qica
>

strata(lith,sp) or interaction(lith,sp)

	-thomas


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