[R] R debugging options
murdoch at stats.uwo.ca
Tue Apr 18 03:16:27 CEST 2006
On 4/17/2006 7:45 PM, Larry Howe wrote:
> What options are available for me to debug my R scripts? For example I
> normally do something like
>> function1("height", "weight")
> myfunctions.R is a large R source file that contains many functions. function1
> is the "main" function in myfunctions.R. It calls many other user-written
> functions that are also in myfunctions.R.
> I only want to debug the R scripts. I do not need to get into the code of R
> itself. I would like to be able to:
> - see the source as I am debugging
> - execute line-by-line
> - see and modify variables
> - have the option to either descend into function calls, or not
> - have the option to either descend into loops, or not
> Maybe this is asking too much but I thought I would lay out my dreams and then
> you can tell me what is really possible.
You can do some of that using the debug() and browser() functions. They
aren't exactly source-level debuggers: they work by showing you
deparsed versions of the code.
Since these aren't source oriented, you don't have the usual "descend"
option. You set a flag on a function, and enter the debugger whenever
that function is called.
Mark Bravington's debug package goes a bit further towards a true
The soon-to-be-released 2.3.0 has information on debugging in the R
Extensions manual. I don't think it's online yet other than as part of
the beta versions. You can also see some mainly Windows oriented
material on my web page,
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