Why the color of my 3D surf figure shows rough when the data is smooth

Hi people,

Why the color of my 3D surf figure shows rough when the data is smooth? My command is surf(S2,S1,V).

If you use the cursor, you will find the V values are actually smooth. I place my data at the link for your consideration. https://chuangsfile.egnyte.com/publicController.do?folderName=20120226&fileName=a75edcbb9cec463c

Can anybody help to have a look?

Answer 1

[Jan]

I get this figure:

What do you expect? What exactly is rough here?