On 12/05/2011 11:02 AM, Elliot Joel Bernstein wrote:
Is it possible to get R to report the line number of an error when a script
is called with source()? I found the following post from 2009, but it's not
clear to me if this ever made it into the release version:
It does so for parse errors. It doesn't record lines of statements at
the top level of a script for run-time errors, but if you define a
function in your script, and call it at a different line, and an error
occurs internally, then R will know which line of the function triggered
the error. If you use options(error=recover) you'll get a display
something like this:
> source("c:/temp/test.R")
Error in f(0) : an error in f
Enter a frame number, or 0 to exit
1: source("c:/temp/test.R")
2: eval.with.vis(ei, envir)
3: eval.with.vis(expr, envir, enclos)
4: g()
5: test.R#6: f(0)
The call to g() was in the test.R script but was not recorded. However,
the function g contains a call to f(0), and that one was recorded as
being at line 6 of the file.
Duncan Murdoch
Here's the test.R file I used:
--------------------------
f <- function(x) {
stop("an error in f")
}
g <- function() {
f(0)
}
g()
----------------------------
ws wrote:
>* Is there a way to have R return the line number in a script when it errors
out?
*>*
*>* I call my script like:
*>*
*>* $ R --vanilla< script.R> output.txt
*>*
*>* I seem to remember a long discussion about this at some point, but I can't
*>* remember the outcome.
*>*
*>*
*
The current development version returns much more information about
error locations. I don't know if it will handle this case (R doesn't
get told the filename in case of input redirection, for example).
Generally the goal is to report error lines during interactive use,
batch use is assumed to already be debugged.
Duncan Murdoch
Thanks.
- Elliot
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