?try On Mon, Mar 31, 2008 at 6:26 PM, CHIB CO <[EMAIL PROTECTED]> wrote: > Dear all, > > I am looking for a way to work out if a file on the internet exists before > attempting to download it using the function download.file(). For example, > using a url that does not exist > > url <- "http://finance.yahoo.com/ftse.csv"; > destfile <- tempfile() > download.file(url = url, destfile = destfile) > > # gives the following response ... > > trying URL 'http://finance.yahoo.com/ftse.csv' > Error in download.file(url = url, destfile = destfile) : > cannot open URL 'http://finance.yahoo.com/ftse.csv' > In addition: Warning message: > In download.file(url = url, destfile = destfile) : > cannot open: HTTP status was '404 Not Found' > > When I am using the download.file() function in a loop over multiple URLs, > the above error will cause the loop to terminate, so I want to avoid this by > checking if the file exists first then wrapping the subsequent functions in > an if() statment. The original fault came from the function get.hist.quote() > in the "tseries" package. I was trying to iterate over various stocks, but > some stocks listed in the yahoo website do not have any downloadable data > associated with them, which causes the loop to terminate. The "workhorse" > function of get.hist.quote() is the download.file() function. > > Kind Regards > > Chib > > _________________________________________________________________ > Win 100's of Virgin Experience days with BigSnapSearch.com > > [[alternative HTML version deleted]] > > > ______________________________________________ > 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. > >
-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ 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.
