On Feb 15, 2012, at 7:19 AM, R. Michael Weylandt wrote:
Sorry about that -- forgot the case where you might only have a
certain entry once: try this,
sapply(split(GS, rownames(GS)), function(x) colSums(as.matrix(x)))
or
sapply(split(GS, rownames(GS)), function(x) if(is.matrix(x))
colSums(x) else x)
I'm not sure if there's a way to force split to give you matrix
elements back but it would be nice.
The help(split) page says there is a 'drop' parameter. That would have
been what I tried first.
--
David Winsemius, MD
West Hartford, CT
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