Do it in a two step process since you want the negation.
> x <- c('file1.xyz', 'file2.xml', 'file3.abc')
> x[-grep("xml$", x)]
[1] "file1.xyz" "file3.abc"
>
On Wed, Oct 1, 2008 at 12:33 AM, zack holden <[EMAIL PROTECTED]> wrote:
>
> Greetings R list,
>
> I am stuck on a simple syntax problem. I want to list all files in a
> directory, excluding files of a certain type. I have tried pattern matching
> as follows:
>
>
> a <- list.files(data, full.name = TRUE, pattern != ".xml") # exclude all
> .xml files
>
>
> The warning returns that my syntax is incorrect. I have read the regexpr help
> files and search old posts to no avail. I'd be grateful if anyone would show
> me the proper syntax for specifying exclusion of certain file types.
>
> Thanks in advance for any help,
>
> Zack
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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