R annoyances 2005-05-19 - By John Fox
Dear Uwe,
I've often wondered why T and F aren't reserved words in R as TRUE and FALSE
are. Perhaps there's some use of T and F as variables, but that seems
ill-advised.
Regards,
John
--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox
--------------------------------
> -----Original Message-----
> From: r-help-bounces@(protected)
> [mailto:r-help-bounces@(protected)] On Behalf Of Uwe Ligges
> Sent: Thursday, May 19, 2005 10:08 AM
> To: Chalasani, Prasad
> Cc: r-help@(protected)
> 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@(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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> >>https://stat.ethz.ch/mailman/listinfo/r-help
> >>PLEASE do read the posting guide!
> >>http://www.R-project.org/posting-guide.html
>
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