[R] Calculate across columns

[stephen sefick]

?apply

look at the MARGIN argument

On Mon, Mar 16, 2009 at 8:56 PM, timbean <timbean at gmail.com> wrote:
>
> I'd like to perform some calculations across a series of columns. Is there an
> easy way to do so? For example, I'd like to calculate the maximum value from
> columns 6-42. Although I can use, say:
>
> pmax(data[,6],data[,7],data[,8], etc.), I'd prefer to be able to do
> something like
>
> pmax(data[,6:42]). Unfortunately, doing so returns 36 columns.
>
> Thanks,
> Tim
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-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis