The problem is at least as old as 2.5.1. Looks like a line disappeared
from trace(), something like:
on.exit(tracingState(tState))
As a result, if an error occurs in the call to trace(), the tracing
state is left FALSE. The workaround is to turn it on explicitly:
tracingState(TRUE)
after which normal behavior should resume.
[EMAIL PROTECTED] wrote:
> trace() seems to be broken in 2.6.1 and R-devel:
>
> Try the example from the ?debug man page:
>
> > library(methods)
> > trace("plot", browser, exit=browser, signature = c("track",
> + "missing"))
> Error in getFunction(what, where = whereF) : no function "plot" found
>
> Okay, it's just an example that doesn't work. Let's try a simpler one,
> the first example from the ?trace man page:
>
> > trace(sum)
> > hist(stats::rnorm(100)) # shows about 3-4 calls to sum()
> > untrace(sum)
>
> No trace! In a clean session without the first error, things are fine:
>
> > trace(sum)
> > hist(stats::rnorm(100)) # shows about 3-4 calls to sum()
> trace: sum(2^(opts - 2))
> trace: sum(2^(opts - 2))
> trace: sum(2^(opts - 2))
> trace: sum(counts)
> trace: sum(2^(opts - 2))
> > untrace(sum)
>
> Duncan Murdoch
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
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