How to draw a 3D surface plot with some disordering points?

I want to draw a 3D surface with the data in the annex.

x, y, z means the X-axis, Y-axis, Z-axis,respectively.

In fact (x,y) is a mesh of the unit square, but not in order. Thus I don't know how to apply mesh or surface on the data.

Answer 1

[KSSV]

load data.mat ; 

xi = unique(x) ; 
yi = unique(y) ; 

[X,Y] = meshgrid(xi,yi) ; 
Z = griddata(x,y,z,X,Y) ; 
surf(X,Y,Z)

[Jian Shi]

Thank u~