How to make a 3D graph with electric potencial?

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josé venâncio
josé venâncio on 26 May 2015
How to make a 3D graph of a uniform electric field's potencial with boundary restrictions with electric strips as a maximum and minimum of the graph? Given a matrix with escalar values, how to do a new matrix whose values are minus the gradient function of the first one? How to make a 2 variable linear regression and it's respective correlation coefficient?

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