On 29.02.2012 19:19, Spencer Graves wrote:
Hi, Simon:
On 2/29/2012 10:04 AM, Simon Urbanek wrote:
On Feb 29, 2012, at 12:37 PM, Spencer Graves wrote:
Hello, All:
What can people tell me about converting back slashes to forward
slashes in character strings?
That's it's trivially done with
gsub("\\", "/", x, fixed=TRUE)
Where x is the character string (and I suppose you are aware of it
since you are using it below).
It does not work for me. Consider the following:
> x <- 'c:\Users\'
Error: '\U' used without hex digits in character string starting "c:\U"
This is something your editor could do much better than R.
Uwe
This is one reason I needed to use "scan". Even if I could get past
this, consider the following:
> x <- '\t'
> gsub('\\', '/', x, fixed=TRUE)
[1] "\t"
It seems far from trivial, which is why I wrote this function and am
looking for a better one.
Thanks for the reply.
Spencer
The rest of this e-mail makes absolutely no sense to me -- what
exactly are you taking about? What else do you want to achieve?
Cheers,
Simon
Several years ago, Prof. Ripley provided a solution, which I lost and
have not been able to find.
Below please find a function to do this. I do not find this very
satisfactory, however, because it uses "scan" and therefore operates
on an input not a character string. Unless someone suggests something
better, I plan to add this to the "sos" package and issue a new
release very soon. (The new release is needed, because the
RSiteSearch capability has been modified in a way that breaks the
current "findFn" core of "sos".)
Thanks,
Spencer
back2forwardslash<- function (nmax = 1, pattern = "\\", replacement =
"/") {
x<- scan(what = character(), quote = pattern, nmax = nmax)
x.<- gsub(pattern, replacement, x, fixed = TRUE)
paste(x., collapse = " ")
}
(x<- back2forwardslash())
c:\Users\
# nmax must be one more than the number of embedded blanks
(x3<- back2forwardslash(3))
c:\u\a b\c d
--
Spencer Graves, PE, PhD
President and Chief Technology Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph: 408-655-4567
web: www.structuremonitoring.com
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