Re: [Rd] Convert "\" to "/"?

From: G See <gsee000_at_gmail.com>
Date: Sat, 09 Jun 2012 21:54:38 -0500

One work around is to comment out the lines that `scan` reads.

    (x <- back2ForwardSlash())
    #c:\Users\

    all.equal(x, '#c:/Users/')

Or, you could pass a text arg through the dots

    (x <- back2ForwardSlash(text="c:\\\users"))     all.equal(x, 'c:/users')

HTH,
Garrett

On Sat, Jun 9, 2012 at 8:40 PM, Spencer Graves <spencer.graves_at_prodsyse.com> wrote:
> Hello, All:
>
>
>          I have for years copied an address like "C:\Program
> Files\R\R-2.15.0\library\MASS\scripts" from Windows Explorer into R, then
> manually replaced "\" with "/".  I have a function to automate this added to
> the development version of "sos".  However, it generates a warning in "R CMD
> check" ("parse error:  unexpected input").  I have so far not found a way to
> eliminate the warning without wrapping examples in "\dontrun" or making the
> examples hard to understand;  neither of these alternatives are acceptable.
>
>
>          The following is my current solution:
>
>
> back2ForwardSlash <- function(nmax=1, what=character(), sep='\n', ...){
>  x2 <- scan(what=what, nmax=nmax, sep=sep, ...)
>  x. <- gsub('\\', '/', x2, fixed = TRUE)
> }
> (x <- back2ForwardSlash())
> c:\Users\
> all.equal(x, 'c:/Users/')
> # TRUE
> x2. <- back2ForwardSlash(2)
> c:\u\a b\n o
> d:/pqr/
> all.equal(x2., c('c:/u/a b/n o', 'd:/pqr/'))
> # TRUE
>
>
> QUESTION:  Might anyone have a better solution and / or simple, clear
> examples that do not generate a warning in "R CMD check"?
>
>
> NOTE:  In case you want to try this development version of "sos" including
> this function, it is available via "svn checkout
> svn://svn.r-forge.r-project.org/svnroot/rsitesearch/" or
> install.packages('sos', repos = "http://R-Forge.R-project.org").
>
>
>          Thanks,
>          Spencer
>
>
> p.s.  Prof. Ripley provided a way to do this on R-help several years ago.
>  Unfortunately, I've been unable to find his solution.
>
> ______________________________________________
> R-devel_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Sun 10 Jun 2012 - 03:34:51 GMT

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