fft - Why there is not dxdy factor in fft2() function of MATLAB? -


in analytical 2d fourier transform, integrand multiplied dxdy. in algorithm of matlab function fft2(), not done.

in discrete case, dx lx/nx , dy = ly/ny,

where lx,ly lengths in metres , nx,ny number of samples in x,y directions.

   https://in.mathworks.com/help/matlab/ref/fft2.html

is not correct multiply dxdy after using fft2() user function i.e. matrix ?

similarly ifft2() function in matlab, there no (dk_x)*(dk_y) dk_x = 1/lx , dk_y = 1/ly

   https://in.mathworks.com/help/matlab/ref/ifft2.html

any appreciated. thanks.


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