Question

What does the gradient function mean?

Answer 1

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The Gradient and Directional Derivative. The gradient of a function w=f(x,y,z) is the vector function: For a function of two variables z=f(x,y), the gradient is the two-dimensional vector <f_x(x,y),f_y(x,y)>. This definition generalizes in a natural way to functions of more than three variables.