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並前往https://discourse.julialang.org/t/the-need-of-i-fftshifts-to-compute-a-pde-using-fourier-transform/56587

The need of (i)fftshift's to compute a PDE using Fourier ...

However, if I replace fft and ifft by fftshift(fft(ifftshift(U))) and ... a screenshot taken from Solving PDEs with the FFT, Part 2 [Python]

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