Function File: condentr_seq (seq_x, seq_y)

Calculates information entropy of the sequence x conditional on the sequence y: H(X|Y) = H(X,Y) - H(Y)

                   X=[1, 1, 2, 1, 1];
                   Y=[2, 2, 1, 1, 2];
                   condentr_seq(X,Y)