I tried aggregate, apply etc, but can't get the right result.
For example,
m <- cbind(c(LETTERS[1:5]), c("aa", "bb", "cc", "aa", "cc")) [,1] [,2][1,]
"A" "aa"[2,] "B" "bb"[3,] "C" "cc"[4,] "D" "aa"[5,] "E" "cc"
how to obtain m.new where "aa", "bb", and "cc" are groups, and more than one
values "A" to "E" belonging to the same group are separated by "|"
[,1] [,2][1,] "aa" "A|D"[2,] "bb" "B"[3,] "cc" "C|E"
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