[R] How sample without replacement on more than one variables?

[dusadrian]

This might help, depending on your exact needs:
> v1 <- sample(letters[1:2], 10, replace=TRUE)
> v2 <- sample(letters[3:4], 10, replace=TRUE)
> v3 <- sample(letters[5:6], 10, replace=TRUE)
> aa <- data.frame(v1=v1, v2=v2, v3=v3)
> aa
   v1 v2 v3
1   a  d  e
2   a  d  e
3   a  c  e
4   b  d  e
5   b  d  f
6   a  c  f
7   a  c  f
8   a  c  f
9   a  c  e
10  b  c  e
> bb <- unique(aa)
> bb
   v1 v2 v3
1   a  d  e
3   a  c  e
4   b  d  e
5   b  d  f
6   a  c  f
10  b  c  e

You can sample from the "bb" dataframe, or from the corresponding rows of
the "aa" dataframe that are unique (1, 3, 4, 5, 6 and 10) which can be
obtained via rownames(bb).

Hth,
Adrian
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