Matlab - Union de dos vectores conjuntos

clear all

a=[3 4 5 8  9]

b=[5 6 7 9 0 12 16 ]

u=b;

for i=1:length(a)

    bol=0;

    for j=1:length(b)

        if a(i)==b(j)

            bol=1;

        end

    end

    if bol==0

        u=[u a(i)];

    end

end

u

>> union_de_vectores

a =

     3     4     5     8     9

b =

     5     6     7     9     0    12    16

u =

     5     6     7     9     0    12    16     3     4     8