-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Uwe Ligges
Sent: Thursday, May 19, 2005 10:08 AM
To: Chalasani, Prasad
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] R annoyances
Chalasani, Prasad wrote:
Thanks all for pointing out that I can use
mtx[,1,drop=F]
Which, for example, won't work for
F <- 10.25
---> drop=FALSE !
^^^^^
Uwe Ligges
-----Original Message-----
From: Uwe Ligges [mailto:ligges at statistik.uni-dortmund.de]
Sent: Thursday, May 19, 2005 10:49 AM
To: Chalasani, Prasad
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] R annoyances
Chalasani, Prasad wrote:
Dear R Folks,
I'm a big fan of R, but there are a couple of things that
annoy me, and I wondered if anyone has neat ways to deal with them.
(a) When using "apply" row-wise to a matrix, it returns
the results column-wise, and to preserve the original
orientation, I've to do a transpose. E.g. I've to keep
doing a transpose, which I consider to be quite annoying.
transformed.mtx <- t(apply( mtx, 1, exp))
(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]".
The docs suggest:
mtx[ , 1, drop = FALSE]
Uwe Ligges