1.1 plot(X,Y) plots vector Y versus vector X. If X or Y is a matrix, then the vector is plotted versus the rows or columns of the matrix,whichever line up. If X is a scalar and Y is a vector, disconnected line objects are created and plotted as discrete points vertically at X.
1.2 plot(X,Y,S)
where S is a character string made from one element from any or all the following 3 columns: