How to get a value(z) from a specific location(x,y) on the mesh/surf in matlab

Darlis Herumurti said:

For example:

[x,y]=meshgrid(1:5:50,1:5:50); % there is a gap in the sequence: 1 6 11 ... not 1 2 3 ...
z = peaks(10); % or some other function
tri = delaunay(x,y); % create triangulation
trisurf(tri,x,y,z) % displaying the data on the surf.

<a title="trisurf.png" href="http://obrazki.elektroda.pl/1634831300_1390149309.png"><img src="http://obrazki.elektroda.pl/1634831300_1390149309_thumb.jpg" alt="trisurf.png" /></a>

Question:
I would like to store the value of the surface (z) for each location (x,y), something like image data/matrix
is there a built-in function to get the from the surface ?

Thanks for your kind help.

Sincerely,
Darlis

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