| debug {base} | R Documentation |
Set or unset the debugging flag on a function.
debug(fun) undebug(fun)
fun |
any interpreted R function. |
When a function flagged for debugging is entered, normal execution
is suspended and the body of function is executed one statement at a time.
A new browser context is initiated for each step (and the previous one
destroyed).
You take the next step by typing carriage return, n or next.
You can see the values of variables by typing their names.
Typing c or cont causes the debugger to continue to the
end of the function (or loop if within a loop).
You can debug new functions before you step in to them from inside
the debugger.
Typing Q quits the current execution and returns you to the
top–level prompt.
Typing where causes the debugger to print out the current
stack trace (all functions that are active).
If you have variables with names that are identical to the controls
(eg. c or n ) then you need to use print(c) and
print(n) to evaluate them.
In order to debug S4 methods (see Methods), you
need to use trace, typically calling browser,
e.g., as
trace("plot", browser, exit=browser, signature = c("track", "missing"))
browser, trace;
traceback to see the stack after an Error: ...
message; recover for another debugging approach.