[Rd] Documentation of colSums et. al (PR#4154)
David Brahm
brahm at alum.mit.edu
Mon Sep 15 12:33:29 MEST 2003
Doug Grove <dgrove at fhcrc.org> wrote:
> Minor mistake in the documentation on the colSums page.
> In the ARGUMENTS section it states for 'dims' that:
> For `col*', the sum or mean is over dimensions
> `dims+1, ...'; for `row*' it is over dimensions `1:dims'.
> These two are reversed.
I think Doug is correct, isn't he? For example, with a 5-dimensional array and
dims=3, colSums() sums over the first 3 dimensions (the "rows") and produces a
2-dimensional result. So the sum is over dimensions 1:dims.
By the way, S-Plus (6.1.2) documentation is also incorrect; it says "colMeans
is a 2 dimensional array consisting of the means across the last 3 dimensions"
but it's really across the first 3 dimensions.
So why has this bug report ended up in the "trashcan"?
--
-- David Brahm (brahm at alum.mit.edu)
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