I have the following scenario:
> m <- matrix(1:4, ncol=2)
> m
[,1] [,2]
[1,] 1 3
[2,] 2 4
> apply(m, 2, sum)
[1] 3 7
> apply(m, 1, sum)
[1] 4 6
So I can apply to rows *or* columns. According to the documentation
(?apply)
MARGIN a vector giving the subscripts which the function will be applied
over. E.g., for a matrix 1 indicates rows, 2 indicates columns, c(1, 2)
indicates rows and columns. Where X has named dimnames, it can be a
character vector selecting dimension names.
But I get the following results:
> apply(m, c(1,2), sum)
[,1] [,2]
[1,] 1 3
[2,] 2 4
How am I to interpret this result?
Thank you.
Kevin
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