[Rd] apply with zero-row matrix

[David Hugh-Jones]

Forgive me if this has been asked many times before, but I couldn't find
anything on the mailing lists.

I'd expect apply(m, 1, foo) not to call `foo` if m is a matrix with zero
rows.
In fact:

m <- matrix(NA, 0, 5)
apply(m, 1, function (x) {cat("Called...\n"); print(x)})
## Called...
## [1] FALSE FALSE FALSE FALSE FALSE

Similarly for apply(m, 2,...) if m has no columns.
Is there a reason for this? Could it be documented?

David
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