Create the nXn matrix F such that y=F*x is the Fourier transform of x.
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When using the 2D Fourier Transform, it's good practice to put the point 0,0 at the middle of the grid, and not at the corner (which will create artifacts). Therefore, a better grid than the one shown at the test suite would be meshgrid((1-N)/2:(N-1)/2,(1-N)/2:(N-1)/2) (for an odd N).