[R] Problem with geterrmessage()

[Dennis Fisher]

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
>> 
>> ______________________________________________
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>> 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