Simple Related Plot Functions:
The other functions which are useful in customizing plots are the figure, clf, hold, leg-end, and grid. The short description of such functions is given here; use help to find out more about them:
clf clears the figure window by eliminating everything from it.
figure generates a new, empty Figure Window whenever called without any argument. Calling it as figure (n); here n is an integer is a way of generating and maintaining multiple Figure Windows, and of referring to each separately.