If your loop is of the form for(i in 1:n) { doSomethingSafe() x <- doSomethingThatFailsSometimes() doSomethingWithX(x) # cannot do this if previous line fails doSomethingElseSafe() }
and you want it to somehow recover when doSomethingThatFailsSometimes() throws an error, then change it to use try() with for(i in 1:n) { doSomethingSafe() tmp <- try({ x <- doSomethingThatFailsSometimes() doSomethingWithX(x) }) if (inherits(try, "try-error")) { recoverFromFailure() } doSomethingElseSafe() } or to use tryCatch() with for(i in 1:n) { doSomethingSafe() tryCatch({ x <- doSomethingThatFailsSometimes() doSomethingWithX(x) }, error = function(e) { message("Had a problem at iteration ", i, ": ", conditionMessage(e)) recoverFromFailure() }) doSomethingElseSafe() } Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf Of Spencer S > Sent: Wednesday, November 09, 2011 2:57 PM > To: r-help@r-project.org > Subject: Re: [R] Help with tryCatch with a for loop > > My apologies for not including some test data. > Attached is a sample dataset that fails with the first stateroute and works > with the second. > > http://r.789695.n4.nabble.com/file/n4021696/testdata.csv testdata.csv > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Help-with-tryCatch-with-a-for-loop- > tp4020475p4021696.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. ______________________________________________ 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.