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eigenfun(n, x) generates the first n fourier series, which are \(\{1/\sqrt{2*\pi}, 1/\sqrt{\pi}*cos(x), 1/\sqrt{\pi}*cos(x), ...\}\) evaluated at x.
eigenfun(n,x)
The number of eigenfunctions used to approximate the boundary. It should be a odd number.
The argument at which the eigenfunctions are evaluated.