[R] Check if data frame column is numeric

[Vitalie Spinu]

On Tue, 16 Dec 2008 16:25:07 +0100, Mark Heckmann <mark.heckmann at gmx.de> wrote:

> Hi R-users,
>
> I want to apply a function to each column of a data frame that is  
> numeric.
> 
colwise(), numcolwise() and catcolwise() in plyr package  turn a function that operates on vectors into one that operates on columns of data frame:

in your case it would be :

numcolwise(your.fun)(your.data.frame)

Vitalie.