file path

Why not just construct a valid file name and use that in cat? You can then use
file.path to join paths together if you want to write to a specific location,
as in your example.

steve

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Wincent
Sent: Wednesday, May 09, 2012 11:15 AM
To: Tal Galili
Cc: r help
Subject: Re: [R] file path

Hmm, I don't think it gives what I want.

For example, I assign a file name to f,

f <- "a?b.txt"
file.path("e:",f)

[1] "e:/a?b.txt"

The resultant character is not accepted as a file name by Windows OS.

On 9 May 2012 20:32, Tal Galili <tal.galili at gmail.com> wrote:

Hi Wincent,
Have a look at:
?file.path



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On Wed, May 9, 2012 at 11:03 AM, Wincent <ronggui.huang at gmail.com> wrote:

Dear all, is there any function to assert whether a file path is
legitimate, and to convert any potential file path to a legitimate
file path?

I automate a batch of files and write them to plain text files with
cat(). The file argument of cat() is generated automatically which
may contain characters such as ? < >, unacceptable in Windows OS.
What I do at this moment is to strip such characters off with gsub().
Is there any direct way to make legitimate file path without detailed
knowledge about the naming rule specific to a OS?

Best

--
Wincent Ronggui HUANG
Sociology Department of Fudan University PhD of City University of
Hong Kong http://homepage.fudan.edu.cn/rghuang/cv/

--
Wincent Ronggui HUANG
Sociology Department of Fudan University PhD of City University of Hong Kong
http://homepage.fudan.edu.cn/rghuang/cv/