Sometimes when encountering an issue in R it is helpful to see precisely where in the compilation process the issue is encountered.
For this, users can run a backtrace of any errors running R code. To capture the backtrace, submit the below two lines via the console prior to running the erroneous R code.
> rlang::global_entrace()
> options(rlang_backtrace_on_error = "full")
Note: this command will only show output when an error is encountered.
The backtrace output will appear in the R console like below:
> rlang::global_entrace() > options(rlang_backtrace_on_error = "full") > > lm(y ~ x , data = mtcars) Error: ! object 'y' not found Backtrace: ▆ 1. ├─stats::lm(y ~ x, data = mtcars) 2. │ └─base::eval(mf, parent.frame()) 3. │ └─base::eval(mf, parent.frame()) 4. ├─stats::model.frame(formula = y ~ x, data = mtcars, drop.unused.levels = TRUE) 5. └─stats::model.frame.default(formula = y ~ x, data = mtcars, drop.unused.levels = TRUE) 6. └─base::eval(predvars, data, env) 7. └─base::eval(predvars, data, env)
This additional diagnostic output can be helpful to review when troubleshooting R issues or when submitting a support ticket.