[R] Redirect output of traceback() to a file?

[Duncan Murdoch]

On 31/08/2011 9:58 AM, . . wrote:
> Hi all,
>
> I am getting evaluation nested too deeply: infinite recursion /
> options(expressions=)? in my code.
>
> Trying to investigate it with traceback() returns a very long list,
> index go even more then 495, so I can not read everything because it
> is not possible to scroll more.
>
> Is it possible to redirect output of traceback to a file? This is the
> only solution I can think, is there another?

You can also look at the .Traceback variable.  The traceback() function 
just prints it in a nice way.  I believe the top of stack is at the end 
of .Traceback, so something like

depth <- length(.Traceback)
.Traceback[depth:(depth-10)]

should print the top ten entries on the stack, topmost first.

Duncan
> Any comments are welcome.
>
> Thanks.
>
> func<- Vectorize(function(x, a, sad, trunc=0, ...) {
>    result<- function(x) {
>      f1<- function(n) {
>        dcom<- paste("d", deparse(substitute(sad)), sep="")
>      	dots<- c(as.name("n"), list(...))
> 			f<- do.call(dcom, dots)
>        g<- dpois(x,a*n)
>        f * g
>      }
>      integrate(f1, 0, Inf)$value
>    }
>    return(result(x) / (1 - result(trunc)))
> }, "x")
>
> func(1, 0.1, exp)
>
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