Dear All,
Am I correct in believing that logical operators such as && and ||
cannot be used as part of
a 'subset' logical expression?
Example:
>foo = as.data.frame(matrix(c(1:9), nrow=3, ncol=3,
dimnames=list(c("r1","r2","r3"),c("c1","c2","c3"))))
>foo
c1 c2 c3
r1 1 4 7
r2 2 5 8
r3 3 6 9
>subset(foo, c1 > 1)
c1 c2 c3
r2 2 5 8
r3 3 6 9
>subset(foo, c2 > 5)
c1 c2 c3
r3 3 6 9
However,
>subset(foo, c1 > 1 && c2 > 5)
[1] c1 c2 c3
<0 rows> (or 0-length row.names)
RR
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