[R] About How to check if a html directory exists

[Jerome Asselin]

On Mon, 2011-04-25 at 12:52 -0500, Wendy Han wrote:
> I want to let R automatically download available files from a website in
> certain folders. Since the files I need, if exist, are in a certain
> directory, I used download.file() function with a predesigned directory.
> However, some of the folders do not have the file I want. When this occurs,
> my program returns error and terminates. So I wonder if there is any way
> that I can check if a directory exists before downloading that file. I
> appreciate your help!

You could use the try() command to catch the download.file() error and,
if there is one, handle it accordingly.

See help(try)

Regards,
Jerome