Numerical integration of two partial derivatives

Good day everybody.

I want to calculate a function z(x,y), knowing numerical values of its
partial derivatives, dx/dy and dz/dy, in points of a grid. With other
words, I have two matrices, px and py, who contains partial derivatives
of z(x,y) with respect to x and y, and I want to find z(x,y). Do you
know how to do that?

Thanks for any help.

Farhad Aslani

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