[R] 2 plots sharing axis / combining factors

[Bill.Venables@cmis.csiro.au]

Two short replies to Thomas's answer:

"strata" is from the survival package.

"interaction" and "strata" do slightly different things.  
The order in which the levels are cycled is different and 

In both cases the new level set is the cartesian product of all the
component level sets, but with strata any vacant levels are pruned, with
interaction they are not.

Bill Venables.

-----Original Message-----
From: Thomas Lumley [mailto:tlumley at u.washington.edu]
Sent: Tuesday, October 01, 2002 11:55 PM
To: juli g. pausas
Cc: r-help
Subject: Re: [R] 2 plots sharing axis / combining factors


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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