Try:

sapply(df, is.numeric)

On Tue, Dec 16, 2008 at 1:25 PM, Mark Heckmann <mark.heckmann@gmx.de> wrote:

> Hi R-users,
>
> I want to apply a function to each column of a data frame that is numeric.
> Thus I tried to check it for each column first:
>
> > apply(df, 2, function(x) is.numeric(x))
>
>     A60       A64      A66a       A67       A71      A75a       A80
> A85       A91       A95       A96       A97       A98       A99
>    FALSE     FALSE     FALSE     FALSE     FALSE     FALSE     FALSE
> FALSE     FALSE     FALSE     FALSE     FALSE     FALSE     FALSE
>
> I get only FALSE results although the variables are numeric. When I try the
> following it works:
>
> > is.numeric(df$A60)
> [1] TRUE
>
> What am I doing wrong?
>
> TIA
> Mark
>
> ______________________________________________
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> PLEASE do read the posting guide
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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