Calculating gradient with NumPy

Question

I really can not understand what numpy.gradient function does and how to use it for computation of multivariable function gradient.

For example

Answer 1

Numpy and Scipy are for numerical calculations. Since you want to calculate the gradient of an analytical function, you have to use the Sympy package which supports symbolic mathematics. Differentiation is explained here (you can actually use it in the web console in the left bottom corner).

You can install Sympy under Ubuntu with

sudo apt-get install python-sympy

or under any Linux distribution with pip

sudo pip install sympy