-------------------------------------- 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-boun...@r-project.org wrote on 03/10/2011 03:51:15 AM: > [image removed] > > [R] tryCatch - Continuing for/next loop after error > > Costas > > to: > > r-help > > 03/10/2011 03:53 AM > > Sent by: > > r-help-boun...@r-project.org > > Please respond to costas.vorlow > > Dear all, > > I am not sure I understand fully the functionality of "tryCatch" and > "try" commands and how these are used to continue a for/next loop if an > error occurs within the loop. > > Can somebody point me to material (or share some code) with more > extensive examples than the ones in the help/FAQ pages? > > Do explain my problem in more detail: > > for (i in 100:1000) > { > ## do some other stuff > > dataset<-head(data,i) > tryCatch(estimatemodel(dataset)) if estimatemodel returns an error (i.e. via a call to stop()), then this should break out of the loop: tryCatch(estimatemodel(dataset), error = function() break) if you want to skip to the next iteration, use: tryCatch(estimatemodel(dataset), error = function() next) > > } > > My for/next loop reads in data (increasing the dataset by one point at > every loop run) and then estimates a model. When the problem is > computationally singular, the loop exits. I want to continue the loop > and register an "error" estimation value for that step. However when I > use use the try tryCatch(estimatemodel(data)) (where estimatemodel() is > a wrapper function calling the model estimation and optimization > routines), the problem still persists. > > Is this the correct way to use tryCatch (or try) or should these go > inside the actual code bits (i.e., in a more low level fashion) that > conduct the optimization and model estimation? > > Apologies if this is not clear enough. > > Best, > Costas > > ______________________________________________ > 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.