Re: [R] R annoyances

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Fri 20 May 2005 - 01:07:52 EST

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@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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R-help@stat.math.ethz.ch mailing list
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 01:27:00 2005

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