Debugging a script or function
Problem
You want to debug a script or function.
Solution
Insert this into your code at the place where you want to start debugging:
browser()
It will pause your code and you will be able to look at and change variables.
In the browser, typing these letters will do things:
| c | Continue |
| n (or Return) | Next step |
| Q | quit |
| Ctrl-C | go to top level |
When in the browser, you can see what variables are in the current scope.
objects()
To pause and start a browser for every line in your function:
debug(myfunction) myfunction(x)
To start debugging when an error is thrown, run this before your function which throws an error:
options(error=recover)