Gradient

The gradient of $f(x,y,z)$ is defined by:

(1)
\begin{align} \nabla f(x,y,z) = grad(f) = \left( \frac{\partial f}{\partial x},\frac{\partial f}{\partial y},\frac{\partial f}{\partial z} \right) \end{align}

where $\partial f / \partial *$ denotes partial derivative.

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