I wrote:
> If all rows are in the same "group", rowsum() returns a vector instead of a
> (1xN) matrix, contrary to documentation:
Thomas Lumley <[EMAIL PROTECTED]> replied:
> Is there a strong preference for changing the function vs changing the
> documentation?
I could live with it either way, but I will point out that the "Examples"
section implies an equivalence between:
R> xsum <- rowsum(x, group)
and
R> xsum2 <- tapply(x, list(group[row(x)], col(x)), sum)
R> xsum3 <- aggregate(x, list(group), sum)
which is broken by this new behavior; xsum2 and xsum3 are (1xN) matrices.
--
-- David Brahm ([EMAIL PROTECTED])
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