On Aug 29, 2009, at 3:14 PM, njhuang86 wrote:
Hey guys,
I was wondering how to create this sequence: 1, 2, 3, 1, 2, 3, 1, 2,
3, 1,
2, 3... with the '1, 2, 3' repeated over 10 times.
As noted earlier
rep(1:3, 10)
Also, is there a simple method to generate 1, 1, 1, 2, 2, 2, 3, 3, 3?
?gl
the gl function will return a factor and it can be converted to a
vector:
> gl(10, 3)
[1] 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7
8 8 8 9 9 9 10 10 10
Levels: 1 2 3 4 5 6 7 8 9 10
> as.numeric(gl(10,3))
[1] 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7
8 8 8 9 9 9 10 10 10
Or you can cobble something together like:
> floor(1 + 0:29 / 3)
[1] 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7
8 8 8 9 9 9 10 10 10
which depends on the higher precedence of the ":" operator over
infix-"+" and "/".
?Syntax
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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