Dear voidobscura,
Try either:
colSums(mdat)

# or

apply(mdat, 2, sum)

See ?colSums and ?apply for more details.

 HTH,

Jorge


On Thu, Jul 16, 2009 at 2:25 PM, voidobscura <nshah171@gmail.com> wrote:

>
> Alright, so I am trying to write my own function to calculate column sums
> in
> a matrix.  I want the result as a single list with the values.
>
> So far I have:
>
> csum<-function(m)
> {
>        a = data.frame(m)
>        s = lapply(a,sum)
>        return(s)
> }
>
> What is the easiest way to have it return in a format such as [1] 6 15 24 ?
>
> Thanks.
> --
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