How can I use colors in my surf, truely?

I've used surf order with a simple method surf(X,Y,Z). X and Y are p*1 matrices and Z is a p*p matrix. I want to use colors to show me differences for z value, but as you see in my surf colors are not used to show contours for z value and maybe this contour is meaningless. How can I solve the problem?

[Walter Roberson]

Please show the relevant code

[Ayob]

figure(4)
surf(YY,XX,Z)

Answer 1

[Azzi Abdelmalek]

surf(x,y,z,z)

[Ayob]

I did it, but *it still doesn't work.*