move up a frame, debug R environment

Question

When debugging a function, I would like to move up to the parent frame and look at some variables there. How do I do this?

Here is a sample:

f <- fun         


        

Answer 1

You can use recover (it is often used to debug code after an actual error, via options(error=utils::recover), but it can be called directly).

> f()
debugging in: g(x + 1)
debug at #1: {
    y = z + 2
    return(y)
}
Browse[2]> ls()
[1] "z"
Browse[2]> recover()

Enter a frame number, or 0 to exit   

1: f()
2: #3: g(x + 1)

Selection: 1
Called from: top level 
Browse[3]> ls()
[1] "x"
Browse[3]> x
[1] 1
Browse[3]>