Reset par() to default values to ensure that a new plot
utilizes a full figure region. This function helps manage the device
surface, especially after previous plotting has altered it.
resetGraph(reset.mf=TRUE)if TRUE reset the multi-frame status; otherwise
preserve mfrow, mfcol, and mfg
invisible return of the reset value par()
This function resets par() to its default values.
If reset.mf=TRUE, it also clears the graphics device with
frame(). Otherwise, the values of mfrow, mfcol,
and mfg are preserved, and graphics continues as usual in
the current plot. Use resetGraph only before a high level
command that would routinely advance to a new frame.