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How do I write a code for Fast Fourier Transform

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Hello! I try to replicate and understand Dr.Rich Radke's code about Fast Fourier Transform from at 15:02 min.
function im = bf(m,n)
N = 256; [x,y] = meshgrid(0:(N-1),0:(N-1)); im = real(exp(-j*2*pi*(m*x/n+n*y/N))); if (m == 0) && (n == 0) im = round(im); end
Seem like some of the essential codes are missing because when I computed, it return with an error:
>> bf Not enough input arguments.
Error in bf (line 4) im = real(exp(-j*2*pi*(m*x/n+n*y/N)));
Please kindly recommend me!!! Thank you in advance!!!

Accepted Answer

Todd Leonhardt
Todd Leonhardt on 31 May 2016
See this good documentation on how to use the built-in fft() function:

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