Hi, I have an R program which takes several days to run, and sometimes hangs while running, presumably stuck in some sort of loop within a package function. I don't know where in the program code it is hanging: it is likely to be within a routine that is iterated many hundreds of thousands of times, each time with different random numbers used.
I'd like to debug the R code, but I can't simply set a breakpoint on the function, as it works fine for the first n-thousand times. What I'd really like to do is to interrupt the running program once it has hung, then step into the function, examining the variables as I go. I can't seem to find a way to do this (i.e. interrupt a routine at an arbitrary time during its run, then step into it using the debugger). Is it possible? Apologies if this is answered in the manuals, but I've had a trawl through and can't seem to find how to do it. I have tried attaching to the process using gdb, but then don't know how to issue gdb commands to invoke the R debugger in the stopped R session. Thanks Yan (n.b. R 2.5.1 on OS X, if that is relevant) ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
