[R] Parser For Line Number Tracing

[Jeff Newmiller]

I recommend making sure your code is built with functions and using the debugger and breakpoints (e.g. [1]) to follow the flow of the code to lead you to where your problem is.

If you are used to building thousand-line top-level scripts then you might not welcome this suggestion, but in that you already have problems you have not admitted to... such things (large top-level scripts) are monsters that will swallow you whole at the slightest change in R, packages, or data.

[1] https://rstudio-education.github.io/hopr/debug.html

On January 18, 2025 3:41:18 PM PST, Ivo Welch <ivo.welch using gmail.com> wrote:
>I often find myself hunting where in my program an error has happened,
>(of course, in R, many error messages are mysterious in themselves,
>too, making it even harder.)  the way I do it is mostly with inserting
>`message()` statements.
>
>what I would really like to have is a parser that inserted 'curline
><<- ##' into the R code, where '##' is the filename and line number.
>something like 'addtracker one.R two.R' and thereafter I can run two.R
>and, when the program dies, use `print curline` to find out where my
>error has roughly occurred.
>
>has someone already written such an 'instrumenter'?
>
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-- 
Sent from my phone. Please excuse my brevity.