On Wed, 24 Sep 2008, Duncan Murdoch wrote:
Shengqiao Li wrote:
On Tue, 23 Sep 2008, Duncan Murdoch wrote:
On 23/09/2008 4:00 PM, Shengqiao Li wrote:
How to use sub, gsub, etc. to replace "\" in a string to "/"?
For example,convert "C:\foo\bar" to "C:/foo/bar".
If those are R strings, there are no backslashes in the first one. It has
a formfeed and a backspace in it.
I did notice that this string was special. It's a legimate R string. If
"f" and "b" are replaced by "d", it will not.
I didn't say it was not legitimate, I said that it contains no backslashes.
If you replace f or b with d, you do not have a legitimate string.
My purpose is to convert a Windows file path (eg. copied from Explorer
location bar) to a R file path through some R function inside R terminal.
The "File->Change dir..." takes a file path like "C:\Acer", but setwd
function will fail.
That's not true. If you enter a backslash in the string, setwd() works fine.
Your problem is that you are confusing R source code with the strings that it
represents. The R source code for the file path C:\Acer is "C:\\Acer". The
R source code "C:\foo\bar" contains no backslashes, it contains the
characters C, :, formfeed, o, o, backspace, a, r.
If you have the string C:\Acer in the Windows clipboard, then you can read it
from there using readClipboard(). (There are many other ways to read the
clipboard as well;
using 'clipboard' as a filename generally works.) You can then pass it to
setwd(), and it will be fine.
Thank you for your reply. readClipboard is a partial solution to this
case. More generally, if I want to wrtie a R program in which users are
asked to input a file path. I want this program to be robust and tolerant,
that is users can type in C:\Acer or C:/Acer. What's the way to do this?
Shengqiao Li
Duncan Murdoch
I guess there must be some ways in R to replace a backslash by slash, eg.
C:\Acer -> C:/Acer. The first problem may be how to pass and save this kind
of strings. encodeString does not work for this, it will just ignore "\".
Shengqiao Li
Duncan Murdoch
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
