R 1.7.1 on Windows XP
The argument 'drop' appears to be ignored when subscripting
1-dimensional arrays (i.e., arrays whose 'dim' attribute has
length 1):
> x <- array(1:5, dim=c(5))
> dim(x)
[1] 5
> dim(x[, drop=TRUE]) # Shouldn't this be NULL?
[1] 5
> dim(x[2:3]) # This seems right: default is drop=TRUE
NULL
> dim(x[2:3, drop=FALSE]) # But this seems wrong
NULL
Note that the behavior with a 2-D array is different:
> y <- array(1:5, dim=c(1,5))
> dim(y)
[1] 1 5
> dim(y[,,drop=TRUE])
NULL
> dim(y[,2:3])
NULL
> dim(y[,2:3,drop=FALSE])
[1] 1 2
Rich Raubertas
Biometrics Research, RY33-300
Merck & Co.
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