Have you read the (latest edition of the) book for which the package you are
using supports? There are differences in S-PLUS and R (and the 4th edition
of MASS supports both, thus ought to tell you this particular difference
between the two). tree() in S-PLUS is written originally by Clark and
Pregibon. If you want that functionality in R, you need to load the `tree'
package (available on CRAN), which is an independent implementation by one
of the co-authors of MASS.
Another hint: Look in the `scripts' subdirectory of where the `MASS' package
is installed.
Andy
> From: chushu Gu
>
> Hi all,
>
> I am using R 1.8.1, I have the following code,
>
> library(MASS)
> data(iris)
> ir.tr <- tree(Species ~., iris)
> ir.tr
> summary(ir.tr)
>
>
> I got the following message:
>
> Error: couldn't find function "tree"
>
> I don't the reason, as I already load the library "MASS".
>
> Could anyone tell me the possible reasons?
>
> Thanks,
>
> Chushu Gu
>
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