suppose I have this function

function_to_run <- function(data){ 
     a = 2 data 
     b = 4 9 
     c = 0 
     a = a   b   c 
     return(a)
}

what I want to do is execute each line in the function one at a time and be able to change the values, for example say I execute the second line b=4 9 but while in the function I want to change that in real time to b=5 9 instead, is there a way to do this.

If I use debug it will just allow me to execute but I can't run it. thanks

CodePudding user response：

You can run statements within debug: f() would have given 18 but it gave 19 because we run the highlighted statement.

> f <- function_to_run <- function() { 
       a = 2 3 
       b = 4 9 
       c = 0 
       a = a   b   c 
       return(a)
  }
> debug(f)
> f()
debugging in: f()
debug at #1: {
    a = 2   3
    b = 4   9
    c = 0
    a = a   b   c
    return(a)
}
Browse[2]> 
debug at #2: a = 2   3
Browse[2]> 
debug at #3: b = 4   9
Browse[2]> 
debug at #4: c = 0
Browse[2]> b <- 5 9  # <-------------------- change b
Browse[2]> 
debug at #5: a = a   b   c
Browse[2]> 
debug at #6: return(a)
Browse[2]> 
exiting from: f()
[1] 19