Debug a function

Usage

debug(fun)
undebug(fun)

Arguments

fun any interpreted R function.

Description

These functions set and unset the debugging flag on a 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). Currently you can only debug functions that have bodies enclosed in braces. This is a bug and will be fixed soon. 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. You can debug new functions before you step in to them from inside the debugger. 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.

See Also

browser, traceback to see the stack after an Error: ... message.


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