How fast fourier transform works on matrix like 3 x 3 matrix
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Hello,
I am still learning about how fast fourier transform works on matrix 3 x 3 i want to see how the calculation to get the number at the final it same goes to inverse fourier transform, please help me the matrix example is
1 2 3
4 5 6
7 8 9
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Walter Roberson
2018년 7월 24일
fft() on a 2D matrix is the same as
result = zeros(size(YourMatrix));
for column = 1 : size(YourMatrix,2)
result(:,column) = fft(YourMatrix(:,column));
end
That is, it just does a column-by-column fft.
fft2() on a 2D matrix is the same as
fft( fft(YourMatrix).' ).'
That is, it does an fft by columns, transposes that so the rows become columns, fft on those columns, and transpose back
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