In Julia:
X = [1 2 3]
Y = [1 2 3;
4 5 6;
7 8 9]
Z = Y * X'
W = hcat(Z, Z) X = [1 2 3]
Y = [1 2 3;
4 5 6;
7 8 9]
Z = Y * X'
W = hcat(Z, Z)