Building a surface plot

Please would someone be willing to help me build a surface plot based on this code:

 a = 5
b = 6
x = 1:a;
y = 1:b;

where z = sin(x/a)*sin(y/b)

Answer 1

[Walter Roberson]

[X, Y] = meshgrid(x, y);
z = sin(X ./ a) * sin(y ./ b);
surf(x, y, z)

[Tom]

That's exactly what I wanted, many thanks.