I would follow this example: https://www.mathworks.com/help/matlab/ref/surf.html#bvgppvs-4
Your 2 vectors (11x1, 5x1) are your X and Y inputs, while the 5x11 array is your Z values. The rows of your array correspond to Y and the columns correspond to X. The syntax would be
X = (1:11)';
Y = (1:5)';
Z = Y*X';
surf(X,Y,Z)