[R] Print warning messages and save them automatically in a file

[Greg Snow]

Would using the 'sink' function with type='message' and split=TRUE do
what you want?

On Thu, Apr 19, 2012 at 2:00 AM, Alexander <juschitz_alexander at yahoo.de> wrote:
> Hello,
> I am working under R2.11.0 Windows and I would like to ask you if you know a
> way to save all warning messages obtained by the R function "warning" in a
> file and keeping the functionalities of the base-function warning. For
> example if I use external code, I don't want to replace all lines containing
> "warning(...)" by a selfwritten function. I want to execute it normally and
> everytime the external code makes a call to warning, I want the warnings
> message printed out in the console AND written in a file.
>
> My first solution is to redefine the function warning in the global
> environment such as:
>
> warning <- function(...){
>   write(...,"Warning.log",append=TRUE)
>   base::warning(...)
> #unfortunately the warning happens always in the function warning of the
> .GlobalEnv
> #and doesn't indicate anymore where the error happens :-(
> }
>
> This solution isn't very clean. I would like to try to redefine
> "warning.expression" in options. In last case, I don't understand how the
> passing of arguments works. I would like to do something like:
>
> options(warning.expression=quote({
>  write(...,"Warning.log",append=TRUE)
>  ?????
>  }))
>
> I put the ???? because I don't know how I should call the function warning
> without being recursive and how I can pas arguments.
>
> Thank you
>
> Alexander
>
> --
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>
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-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com