[R] Find classes of each column of data.frame()

[Gabor Csardi]

A data frame is a special list:

> d <- data.frame( A=numeric(), B=logical(), C=character() )
> lapply(d, class)
$A
[1] "numeric"

$B
[1] "logical"

$C
[1] "factor"

Gabor

On Tue, Jul 01, 2008 at 03:50:18PM +0200, Dong-hyun Oh wrote:
> Dear UseRs,
>
> I would like to know the way to find classes of each column of  
> data.frame().
>
> Thank you in advance.
>
>
>
>
> =========================================================
> Dong-hyun Oh
> Center of Excellence for Science and Innovation Studies
> Royal Institute or Technology, Sweden
> e-mail: oh.dongh at gmail.com
> cel: +46 73 563 45 22
>
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-- 
Csardi Gabor <csardi at rmki.kfki.hu>    UNIL DGM