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 ______________________________________________ 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.
