[R] pooling categories in a table

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Thu Apr 11 20:40:15 CEST 2002


On Tue, 9 Apr 2002, Strumila, John wrote:

> beautiful, I didn't realise you could use "c(2,3)".  Its not in "help".  I
> guess it's so obvious now...

I beg to differ: it is under MARGIN in help(apply) (and in a couple of
good books on S).

Also note that some 1.5.0 colSums() will do this sort of thing a mite
more efficiently.

>
> John Strumila
>
>     > apply(tab, c(2,3), sum)  # sums over first coordinate
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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