[R] Problem with geterrmessage()

[Bert Gunter]

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 <fisher at 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-tierney at 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 at 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-tierney at uiowa.edu
> > Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu
>
> ______________________________________________
> R-help at 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.
>

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