R annoyances 2005-05-19 - By Uwe Ligges
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@(protected)]
> Sent: Thursday, May 19, 2005 10:49 AM
> To: Chalasani, Prasad
> Cc: r-help@(protected)
> 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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