gradient(self, x, y)
x and y coordinates of the same shape and any number of dimensions.
2 masked arrays of the same shape as x and y; values corresponding to (x, y) points outside of the triangulation are masked out. The first returned array contains the values of $\frac{\partial z}{\partial x}$ and the second those of $\frac{\partial z}{\partial y}$ .
Returns a list of 2 masked arrays containing interpolated derivatives at the specified (x, y) points.
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