warning message using surf
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Walter Roberson on 27 Sep 2021
We cannot tell what length(u) or length(v) or size(Xq) or size(Yq) is.
You could get an error if size(Xq) is not the same as size(Yq) or size(Zq) or size(V_1)
I suspect that could be written as
V_1 = reshape(vq_1, size(Xq));
I speculate that some values of vq_1 are NaN because you did not ask for extrapolation in the griddata()