From: Uwen on
I am trying to figure out a way to plot a 3d surface in matlab.
There are lots of data x and y,z is indepentent of x and y. I only
want to plot a circle surface with the conditions:
x^2+y^2<=25
but I awalys get a rectangular surface.
I tried using loop to delete the data x^2+y^2>25, but the resuts looks
ugly.

How should I solve this problem?


Thanks in advance.