[R] How to catch errors regarding the hessian in 'optim'

[William Dunlap]

> in tryCatch define an error handler
> 
> error = function(e){
> 
>     text <- print(e)        # surely there must be better ways
> 
>     # parse text for substring 'optim' or more strongly characteristic substrings

Note that print() should aways return its 'x' argument, so 'text' and 'e' will
be identical here.  conditionMessage(e) will give the error message (a character
string) and conditionCall(e) will give the call (a language object) to the function
which threw the error.  You probably want to use grep on conditionMessage(e).

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
> Of Michael Meyer
> Sent: Thursday, September 26, 2013 8:50 AM
> To: r-help at r-project.org
> Subject: [R] How to catch errors regarding the hessian in 'optim'
> 
> I am weighing in even though I know nothing.
> 
> in tryCatch define an error handler
> 
> error = function(e){
> 
>     text <- print(e)        # surely there must be better ways
> 
>     # parse text for substring 'optim' or more strongly characteristic substrings
>     # you have already seen to emerge from optim
>     # do what you have to do if such is detected
> }
> 
> 
> Sorry if this answer seems trivial.
> 
> Michael Meyer
> 
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