[R] convert 400 numeric variables to categorical together

[R. Michael Weylandt]

How are they arranged currently? And should they be all one set of
levels or different factor sets?

Michael

On Tue, May 8, 2012 at 12:32 PM, ya <xinxi813 at 163.com> wrote:
> Hi everyone,
>
> Is there anyway I can convert more than 400 numeric variables to categorical variables simultaneously?
>
> as.factor() is really slow, and only one at a time.
>
> Thank you very much.
>
> ya
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