On 20/05/2014 12:04 PM, Knut Krueger wrote:
Am 20.05.2014 17:32, schrieb Bert Gunter:
>> paste("a","b",sep="\\") ## "\\" is the escaped single backslash
> [1] "a\\b"
>> cat(paste("a","b",sep="\\"))
> a\b
>
> Does this help clarify? Or have i misunderstood you?
@David and @Bert
unfortunately yes. My question is more a system level question as about
any converting functions.
The question is how to paste a windows path directly into an R script
(without readline() or readClipboard() and how could I convert this
string that it is usable in R. Means any function which is not using
escape characters
it seems to be possible for readline() an readClipboard().
I do not want to use y=readline() I do want to use
y=foo("c:\foo1\foo2\") but this seems to be impossible because R is
interpreting one backslash as escape sequence. So how does readline()
and readClipboard() are working? Is there any other callback from utils
which is able to deal with this?
The difference between the two cases is that you are trying to write
something in the R language when you write
y=foo("c:\foo1\foo2\")
but that is not a legal R statement, since you never close the opening
quote. When using readLines() etc., you're just reading data, you're
not trying to parse it as R code.
I have no idea what you mean by a "callback from utils".
If you want to solve the problem "I have a pathname in the clipboard,
and want to put it in a string", it's not hard to write
a function that essentially does readLines("clipboard"). It's a little
harder to make that platform-neutral, but it sounds as if you're only
working on Windows.
If you want to solve the problem, "I want to write some R source code
that contains a pathname, but I don't want to escape the backslashes",
then I think you're out of luck. There are ways to read data inline in
your source, e.g. you can paste
f <- scan(what="character")
c:\foo1\foo2\
into your console to read x, but that doesn't work with source(), so I'd
avoid it.
Duncan Murdoch
I am afraid there is no way.
The reason is to prevent errors for beginning windows R user. If the
path is long they either forget to convert one backslash or all and then
they are frustrated that it is not working. And telling them to use
search and replace ... Whatever they would replace it might be worse
than before ;-)
regards Knut
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