Let say, I have a character vector of arbitrary length:
Vector <- c("a", "b", "c")
Using that vector I would like to create a matrix (with number of columns as 2)
with all pairwise combinations of those elements, like:
Vector <- c("a", "b", "c")
Mat <- rbind(c("a", "b"), c("a", "c"), c("b", "c")); Mat # number of rows
will obviously be n(n-1)/2
[,1] [,2]
[1,] "a" "b"
[2,] "a" "c"
[3,] "b" "c"
Order must be kept same as c("c", "a") or c("c", "b") would not be allowed.
Additionally, actually I have a very big initial character vector therefore I
need to maintain speed as well.
I would be really grateful if somebody guide me how to do that
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