Try this:
> x
V1 V2 V3
1 1 15 34
2 1 4 66
3 1 24 65
4 2 23 47
5 2 9 36
6 3 58 9
7 3 38 64
8 3 12 64
9 3 4 15
10 4 1 88
11 4 23 90
x[tapply(seq(nrow(x)), x$V1, sample, 1),]
On Tue, Nov 9, 2010 at 9:01 PM, Achim Eberhart <
a.eberh...@pgrad.unimelb.edu.au> wrote:
> G'
G'day R-helpers,
I want to subsample rows of a large table based on the value in its
first column. Of all rows sharing the same value in the first column I
want to RANDOMLY extract only one.
Thanks in advance,
Achim
example input
1 15 34
1 4 66
1 24 65
2
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