Calculate the partial sum of Fourier series ?

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Rémi on 25 Sep 2014

Hello,

I have the analytical solution of the 3D heat equation, which is an infinite series solution.

I would like to calculate the nth partial sum of this solution, theta(x,y,0) as expressed in the attached file.

How could it be achieved in an efficient way ? I would like to calculate it for N=10000.

Thank you for your help,

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