How to find derivative values for a given 3D data.

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saurabh il 23 Feb 2016

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https://it.mathworks.com/matlabcentral/answers/269567-how-to-find-derivative-values-for-a-given-3d-data

Suppose I have data set {(x_i, y_i, z_i):i=1,2,3,4} and I want to know that derivative values. Which method is applicable here. If you have 2D data {(x_i, y_i):i=1,2,3,4} then by arithmetic mean method and geometric mean method we can find the derivative values.