Re: [R] download.file error

From: jim holtman <jholtman_at_gmail.com>
Date: Mon, 31 Mar 2008 18:33:35 -0500

?try

On Mon, Mar 31, 2008 at 6:26 PM, CHIB CO <chibco_at_hotmail.com> 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_at_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_at_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.
Received on Mon 31 Mar 2008 - 23:35:23 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Tue 01 Apr 2008 - 15:00:27 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive