[R] extraction

[Heberto Ghezzo]

Hello.
If I understood BDR correctly then when I want so subset a data 
frame, matrix etc. instead of doing
x1 <- x[group == 1]
i should do
x1 <- x[group %in% 1]
the second way being the preferred way to avoid problems with 
NA's?
As always thanks to BDR for his prompt , and to the point, 
response.

R. Heberto Ghezzo  Ph.D.
Meakins-Christie Labs
McGill University
Montreal - Canada
heberto at meakins.lan.mcgill.ca
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