[R] How to do this "combination"?
wanr@ucalgary.ca
wanr at ucalgary.ca
Thu Sep 9 00:51:30 CEST 2004
Hi all,
source vector = (1,2)
the length of the target vector = 3
My expected "complete" output should be:
111, 112, 121, 122, 211, 212, 221, 222 (they are Not numerical numbers, they
are equivalent to abc and aab etc.).
Not perfect solutions suggested by others so far:
solution1: sample(c(1,2),3,replace=TRUE) just gives me one "randomly
sampled" combination at a time. However, I need the whole list displayed
above at a time.
solution2: as.matrix(expand.grid(1:2, 1:2, 1:2)) almost implements what I
need.
However, in my case, the length of the target vector is not fixed in
advance. For example, the output might be 11111, 11112, and etc coming from
the source vector (1,2).
Thanks in advance.
Rui
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