Save All Calls or Frames on Errors
DESCRIPTION:
Specify how to create the last.dump object when an error occurs.
USAGE: 
dump.calls()
dump.frames()
SIDE EFFECTS:
object last.dump is created when either dump.calls or dump.frames is executed.
DETAILS:
Function dump.calls dumps the current call stack; dump.frames dumps the call stack and all frames. Dumping the frames may take much more time than dumping calls, since the frames contain all intermediate data objects. However, the frames provide information that the browser-like function debugger can use to help you understand the state of the computations when an error occurs.
BACKGROUND:
These functions are typically used as an error action to save the current call stack or frames as an object that can later be examined by the traceback and/or debugger functions. When called, they write the message "Dumped" to the terminal.

Function dump.calls is the default error action in the .Options data object.

SEE ALSO:
options , traceback , debugger , browser , restart , warnings , trace .
EXAMPLES: 
# after an error occurs
options(error=dump.frames)


# reproduce error
debugger()


# after debugging is finished
options(error=dump.calls)