[R] How to catch warnings

[Michael Bedward]

Sorry Alex, I don't quite follow what you want.  What do you mean by
"it would be nicer if the execution is paused so to try to print more
values" ?

Michael

On 18 November 2010 21:11, Alaios <alaios at yahoo.com> 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.
>
> Best REgards
>
> Alex
>
> --- On Thu, 11/18/10, Michael Bedward <michael.bedward at gmail.com> wrote:
>
> From: Michael Bedward <michael.bedward at gmail.com>
> Subject: Re: [R] How to catch warnings
> To: "Alaios" <alaios at yahoo.com>
> Cc: "Rhelp" <r-help at 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 at 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]]
> >
> >
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