[R] randomForest: more than one variable needed?

[Torsten Hothorn]

On Tue, 13 Apr 2004, Hui Han wrote:

> Hi,
>
> I am doing feature selection for my dataset. The following is
> the extreme case where only one feature is left. But I got
> the error below. So my question is that do I have to use
> more than one features?
>
> sample.subset
>   udomain.edu hpclass
> 1        -1.0     not
> 2        -1.0     not
> 3        -0.2     not
> 4         1.0      hp
> 5         1.0      hp
> > randomForest(hpclass ~., data=sample.subset, importance=TRUE);
> Error in if (n == 0) stop("data (x) has 0 rows") :
>         argument is of length zero
>

no idea about the error message, but there is no need for feature
selection before using random forests - give it a try without
preselection of variables.

best

Torsten

> Best regards,
> Hui Han
> Department of Computer Science and Engineering,
> The Pennsylvania State University
> University Park, PA,16802
> email: hhan at cse.psu.edu
> homepage: http://www.cse.psu.edu/~hhan
>
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