I've read the help and the archives on tryCatch but I'm still stuggling trying to understand how it works exactly and how I can use it to get the result I need. I have a data.frame of urls which point to 11 .zip files. Basically I use RCurl to get the list of files from a ftp and then reduce that directory dump to the 11 zip files I want to download. Its easy enough to do that in a loop over the elements in data.frame. The problem is that the site is very inconsistent. All 11 files will download, but I will get random warnings that the size of some of the files does not match what was downloaded. So at the end of the loop I may get 5 warnings about the file size not matching. These files, when tried a second or third time, will eventually download properly. What I want to do is record which files had this download warning. [[alternative HTML version deleted]]
tryCatch will only execute it's error function on errors. If you are getting warnings, you may find it helpful to set: options(warn = 2) ?options tryCatch(warning("!"), error = function(x) print("Error!")) -------------------------------------- Jonathan P. Daily Technician - USGS Leetown Science Center 11649 Leetown Road Kearneysville WV, 25430 (304) 724-4480 "Is the room still a room when its empty? Does the room, the thing itself have purpose? Or do we, what's the word... imbue it." - Jubal Early, Firefly r-help-bounces at r-project.org wrote on 03/18/2011 03:04:41 PM:> [image removed] > > [R] Understanding tryCatch > > steven mosher > > to: > > r-help > > 03/18/2011 03:07 PM > > Sent by: > > r-help-bounces at r-project.org > > I've read the help and the archives on tryCatch but I'm still stuggling > trying to understand how it > works exactly and how I can use it to get the result I need. > > I have a data.frame of urls which point to 11 .zip files. Basically Iuse> RCurl to get the list of > files from a ftp and then reduce that directory dump to the 11 zip filesI> want to download. > > Its easy enough to do that in a loop over the elements in data.frame. > > The problem is that the site is very inconsistent. All 11 files will > download, but I will get random > warnings that the size of some of the files does not match what was > downloaded. > So at the end of the loop I may get 5 warnings about the file size not > matching. > These files, when tried a second or third time, will eventually download > properly. > > What I want to do is record which files had this download warning. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guideR-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code.
Try this: tryCatch(log(rnorm(10)), warning = function(m)deparse(m$call[[2]])) Where log(rnorm(10)) is your expr to evaluate. On Fri, Mar 18, 2011 at 4:04 PM, steven mosher <moshersteven at gmail.com> wrote:> I've read the help and the archives on tryCatch but I'm still stuggling > trying to understand how it > works exactly and how I can use it to get the result I need. > > I have a data.frame of urls which point to 11 .zip files. Basically I use > RCurl to get the list of > files from a ftp and then reduce that directory dump to the 11 zip files I > want to download. > > Its easy enough to do that in a loop over the elements in data.frame. > > The problem is that the site is very inconsistent. All 11 files will > download, but I will get random > warnings that the size of some of the files does not match what was > downloaded. > So at the end of the loop I may get 5 warnings about the file size not > matching. > These files, when tried a second or third time, will eventually download > properly. > > What I want to do is record which files had this download warning. > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >-- Henrique Dallazuanna Curitiba-Paran?-Brasil 25? 25' 40" S 49? 16' 22" O