RE: [R] R annoyances

From: Chalasani, Prasad <prasad.chalasani_at_gs.com>
Date: Fri 20 May 2005 - 01:02:59 EST


Thanks all for pointing out that I can use

        mtx[,1,drop=F]

-----Original Message-----
From: Uwe Ligges [mailto:ligges@statistik.uni-dortmund.de] Sent: Thursday, May 19, 2005 10:49 AM
To: Chalasani, Prasad
Cc: r-help@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 repeatedly 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))

I'd rather type

   exp(mtx)

> (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

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri May 20 01:24:01 2005

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