This MATLAB function creates a 2-D line plot of the data in Y versus the
corresponding values in X.If X and Y are both vectors, then they must have equal
length and MATLAB plots Y versus X.If X and Y are both matrices, then they must
have equal size and MATLAB plots columns of Y versus columns of X.If one of X or
Y is a vector and the other is a matrix, then the matrix must have dimensions
such that one of its dimensions equals the vector length.