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.

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
>
>
>
>
>
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