On Sep 1, 2010, at 11:34 AM, David Winsemius wrote:
snipped
> t( apply(a, 1, function(x) colnames(a)[order(x)]) )
[,1] [,2] [,3] [,4]
[1,] "A" "C" "B" "D"
[2,] "A" "C" "B" "D"
[3,] "D" "B" "C" "A"
[4,] "B" "A" "C" "D"
[5,] "C" "D" "B" "A"
(apply returns a transposed version.)
That is over-broad. apply() only returns a "transposed" result of a
matrix when the second argument is "1". It is (as I understand it
anyway) supplying results for building another matrix in the default,
for R, column-major order. If you start with rows uou gt columns. If
your start with columns you get columns. And someday I will figure out
how this generalizes to arrays.
apply(mtx, 1, I) #transposes
apply(mtx, 2, I) #does not "transpose"
--
David Winsemius, MD
West Hartford, CT
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