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Interpolate value of point

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Aleksey Gureev
Aleksey Gureev 2021-2-9
评论： Aleksey Gureev 2021-2-9
Hello. I have a sufrace like on the image.How can I interpolate z-value (black cross) from this surface? I need the fastest methos (linear, for example)

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Bob Thompson
Bob Thompson 2021-2-9
I'm assuming you have the data for the surface points. If so, I believe interp2 will do what you're asking.
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Aleksey Gureev
Aleksey Gureev 2021-2-9
编辑：Aleksey Gureev 2021-2-9
Hello. Thank you for your answer. How can I use it? I tried like this
interp2(X, Y, V, 0, 0) - if I want to get at x = 0, y = 0, but It doen't work for me. Numbers in X and Y not monotonic.
Aleksey Gureev
Aleksey Gureev 2021-2-9
Solved
xv = linspace(min(x), max(x), 20);
yv = linspace(min(y), max(y), 20);
[X,Y] = meshgrid(xv, yv);
Z = griddata(x,y,z,X,Y);
interp2(X, Y, V, 0, 0)

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