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:[EMAIL PROTECTED] 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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