[R] how to get empty sequence for certain bounds
Tamas K Papp
tpapp at Princeton.EDU
Wed Nov 15 17:35:44 CET 2006
Hi,
I have encountered this problem quite a few times and thought I would
ask.
Let's say that I have two endpoints, a and b, which are integers. If
a <= b, I would like to get a:b, but if a > b, then numeric(0), for
example:
myseq(3,5) => 3:5
myseq(3,3) => 3
myseq(3,2) => numeric(0)
The operator : just gives decreasing sequences in the latter case, and
I could not coax seq into doing this either (of course the
documentation is correct, it never claims that I could). Should I
just write my own function, or is there a standard R way to do this?
Thanks,
Tamas
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