On Thu, 19 May 2005, Chalasani, Prasad wrote:
(b) When extracting 2 or more columns of a matrix,
R returns the result as a matrix, BUT when extracting
just one column, it returns a vector/array, rather than
a matrix, so I've to keep doing as.matrix, which is annoying.
sub.mtx <- as.matrix(mtx[,1])
Of course I could write a suitable function
cols <- function(mtx,range) as.matrix(mtx[, range])
but then I lose the syntactic sugar of being able to say "[,1]".
This one is actually a FAQ,
mtx[,1,drop=FALSE]
-thomas
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