Hi clsnyder,
You forgot the MARGIN argument in you function call. Take a look at ?apply
apply(iris, 2, length)
apply(iris, 2, mean)
HTH,
Jorge
*
*
On Sat, Sep 17, 2011 at 6:42 PM, clsnyder <> wrote:
> Why does one method work, and the other not?
>
> attach(iris)
> head(iris)
>
> mean(Sepal.Length)
> [1] 5.843333
>
> apply(iris, Sepal.Length, mean)
> "Error in if (d2 == 0L) { : missing value where TRUE/FALSE needed"
>
> I seem to get this error frequently with the apply functions but other
> "manual" methods work normally on the same data.
>
> TIA
>
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