[R] where does the null come from?

[Gabor Grothendieck]

> out <-   apply(m, 1, cat, '\n')
1 3
2 4
> out
NULL


On Wed, May 13, 2009 at 5:23 AM, Wacek Kusnierczyk
<Waclaw.Marcin.Kusnierczyk at idi.ntnu.no> wrote:
>    m = matrix(1:4, 2)
>
>    apply(m, 1, cat, '\n')
>    # 1 2
>    # 3 4
>    # NULL
>
> why the null?
>
> vQ
>
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