Message-ID: <20121012125220.60082air9p6af80k.mkarhune@webmail.helsinki.fi>
Date: 2012-10-12T09:52:20Z
From: Markku Karhunen
Subject: Loss of dimensions in subsetting arrays
Hi all,
I've been wondering for a long time why R drops the dimensions of an
array/matrix when you try to take a subset of one column. I mean this:
dim(A)
[1] 2 5 2
B=A[1,,]
dim(B)
5 2 # so now dim(B)[3] doesn't work
C=B[2,]
dim(C)
NULL # so now nrow(C) doesn't work
Typically, you can get rid of this by writing as.matrix, as.array(...)
but that generates extra lines of code. This is really annoying. Does
anybody know how to turn this behaviour off?
best,
Markku Karhunen
Uni. Helsinki