Please read ?try (again) carefully.In paticular note (under Value): "The value of the expression if expr is evaluated without error, but an invisible object of class "try-error"containing the error message, and the error condition as the "condition" attribute, if it fails."
so: attr(ERRORMESSAGE, "conditon") will give you the error conditon. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Thu, Feb 22, 2018 at 1:01 PM, Dennis Fisher <fis...@plessthan.com> wrote: > Luke > > Thanks — I revised the code to: > ERRORMESSAGE <- try(source(USERSCRIPTFILE, local=T), silent=T) > > print(ERRORMESSAGE) now returns: > $value > [1] 0 > > $visible > [1] FALSE > > Not clear what to make of that. > > Dennis > > > Dennis Fisher MD > P < (The "P Less Than" Company) > Phone / Fax: 1-866-PLessThan (1-866-753-7784) > www.PLessThan.com > > > > > > On Feb 22, 2018, at 12:45 PM, luke-tier...@uiowa.edu wrote: > > > > Only the default error handler puts the error message in a buffer > > where it can be retrieved with geterrmessage. try() replaces the > > default error handler. Either look at the value returned by try() or > > use tryCatch with conditionMessage. > > > > Best, > > > > luke > > > > On Thu, 22 Feb 2018, Dennis Fisher wrote: > > > >> R 3.4.3 > >> OS X > >> > >> Colleagues > >> > >> I have a 20K line script in which I encounter an unexpected problem. > >> > >> If the script detects presence of a particular file USERCODE.txt, it > executes: > >> source(“USERCODE.txt”) > >> If that file is not present, the script executes without a problem. > >> > >> There might be syntax errors in USERCODE.txt; therefore, the code above > is embedded in a try command: > >> try(source(“USERCODE.txt", local=T), silent=T) > >> followed by: > >> ERRORMESSAGE <- geterrmessage() > >> > >> For unclear reasons, an earlier command is yielding an error message: > >> unused argument (\"\\n\") > >> Despite identifying the exact source of that error, I can’t fix it (and > it is of no consequence). > >> > >> Ideally, I would like to clear out the pre-existing error message > immediately before the “try” command (or perhaps at that particular > location where it is being created) — but I can’t figure out how to do so. > >> > >> Any suggestions would be welcome. > >> > >> Dennis > >> > >> Dennis Fisher MD > >> P < (The "P Less Than" Company) > >> Phone / Fax: 1-866-PLessThan (1-866-753-7784) > >> www.PLessThan.com > >> > >> ______________________________________________ > >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >> 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. > >> > > > > -- > > Luke Tierney > > Ralph E. Wareham Professor of Mathematical Sciences > > University of Iowa Phone: 319-335-3386 > > Department of Statistics and Fax: 319-335-3017 > > Actuarial Science > > 241 Schaeffer Hall email: luke-tier...@uiowa.edu > > Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.