use:

sum(x,na.rm=T)

like this:

my.row.sums <- apply(my.matrix,1,sum,na.rm=T)

If you want to do across columns then use 2 instead of 1.  Look at ?apply
and ?sum.

Adrian

On Fri, May 29, 2009 at 7:46 AM, Wade Wall <wade.wall@gmail.com> wrote:

> Hi all,
>
> I have a binary matrix with NAs included.  Each row and column
> includes at least one NA, so I don't want to omit them.  Is there a
> way to sum across rows and columns, ignoring the NAs but not deleting
> the row or column?  If not, I suppose I can write a loop function, but
> I have learned that it is best to stay away from loops if possible.
>
> Thanks for any help,
>
> Wade
>
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