[O] Evaluating R source code line by line

[Vikas Rawal]

I have an R source code blocks called with the ":results value” option. I 
evaluate the code with C-c. When I do that, in my R session buffer, I get to 
see several + + + until the final value is obtained, and then the final value 
is shown, and inserted in my Org buffer.

I was wondering if there is an option somewhere that will allow me to instead 
see how each line in my R source code is evaluated. That is, the R session 
buffer should show each line being evaluated, and then show the final value as 
usual.

Vikas