Thanks a lot. Unfortunately browser() works pretty bad for me. As I am using Rkward this gives me a prompt while at the same time R console is blocked which make things not very easy.

Regards
Alex

--- On Thu, 11/18/10, Rainer M Krug <r.m.krug@gmail.com> wrote:

From: Rainer M Krug <r.m.krug@gmail.com>
Subject: Re: [R] How to catch warnings
To: "Alaios" <alaios@yahoo.com>
Cc: "Michael Bedward" <michael.bedward@gmail.com>, "Rhelp" <r-help@r-project.org>
Date: Thursday, November 18, 2010, 11:37 AM

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On 11/18/2010 11:11 AM, Alaios wrote:
> Dear Michael,
> I would like to thank you for your reply. This line made things easier. One more question what If I want to halt or pause the program when a warning happens? Right now I get only a message printed but it would be nicer if the execution is paused so to try to print more values.

What about the following? Is that what

x <- 1:4
y <- list(good=2:5, bad=3:5)
for (yy in y) {
  tryCatch( x <- cbind(x, yy),
      warning=browser
  )
}

Cheers,

Rainer

> 
> Best REgards
> 
> Alex
> 
> --- On Thu, 11/18/10, Michael Bedward <michael.bedward@gmail.com> wrote:
> 
> From: Michael Bedward <michael.bedward@gmail.com>
> Subject: Re: [R] How to catch warnings
> To: "Alaios" <alaios@yahoo.com>
> Cc: "Rhelp" <r-help@r-project.org>
> Date: Thursday, November 18, 2010, 1:26 AM
> 
> Hi Alex,
> 
> Something like this ?
> 
>  x <- 1:4
>  y <- list(good=2:5, bad=3:5)
>  for (yy in y) {
>    tryCatch( x <- cbind(x, yy),
>        warning=function(w) cat("problem values: ", yy, "\n")
>    )
>  }
> 
> Michael
> 
> 
> On 18 November 2010 03:19, Alaios <alaios@yahoo.com> wrote:
>> Hello when my code executes I receive the message that were some warnings. I want to catch warning messages at run time so to print some local variables and try to understand why this warning happens.
>>
>> I searched on internet and I tried withCallingHandlers(
>> which seems to work but as I used Rkward the result is awful. I get a prompt to copy paste a value only while at the same time my background window with my code is not anymore accessible.
>>
>> Actually I get the warning that
>> In f[cbind(shweights[, 1], shweights[, 2])] * shweights[,  ... :
>>   longer object length is not a multiple of shorter object length
>>
>> and what I want is when the warning appear to be able to print the value shweights[,1] shweights[,2] to see what is going on.
>>
>> Any easier way to do that?
>> Best REgards
>> Alex
>>
>>
>>
>>
>>
>>        [[alternative HTML version deleted]]
>>
>>
>> ______________________________________________
>> 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.
>>
>>
> 
> 
> 
>       
>     [[alternative HTML version deleted]]
> 
> 
> 
> 
> ______________________________________________
> 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.


- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Natural Sciences Building
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Stellenbosch University
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Skype:      RMkrug
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