[R] summing items within a row

[Q]

Hello,

I am trying to figure out how to do a sum of items within a row.  For
example, I have a data frame something like this:

    A1 B1 ... A2 B2 ...
1   1   4        1  4
2   2   5        2  5
3   3   6        3  6

What I want, is for each row, to get A1 + A2, B1 + B2, etc. which would,
perhaps, give me a vector something like this c(2, 8, ... 4, 10 ... 6, 12).

Does anyone know of a simple way to do this?

Thanks a lot,

Q

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