trace() problems (PR#10498)
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.
murdoch at stats.uwo.ca 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
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