[R] Find classes for each column of a data.frame

[David Winsemius]

On Aug 26, 2010, at 11:31 AM, Daniel Brewer wrote:

> Hello,
>
> Is there a simple way to get the class type for each column of a
> data.frame?  I am in the situation where I would like to get all the
> columns of a data.frame that are factors.
>
> I have tried:
> apply(df,2,class)
> but all the columns come back as class "character".

Just realized it happens because of matrix coercion.

--

David Winsemius, MD
West Hartford, CT