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hermitian symmetry in IFFT !

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rahman
rahman 2013-9-7
回答： Jakob Ameres 2016-5-24
Hi all. I have a matrix as a 2D spectrum. now, I want to transform it to time domain. when I use IFFT, the results are complex numbers, but it should be real numbers! so I have to have hermitain symmetry. how can i do that?
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rahman
rahman 2013-9-9
it is about the real part.
Walter Roberson
Walter Roberson 2013-9-9
Can you create a small example?
Are you doing anything between the fft and ifft ?

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回答（2 个）

Honglei Chen
Honglei Chen 2013-9-9
If it is some small imaginary part due to numerical precisions, you can probably preprocess your input to IFFT by doing
x = (x+x')/2
This makes x Hermitian
Jakob Ameres
Jakob Ameres 2016-5-24
Use the symmetric flag for the ifft.
ifft( data, [], dim, 'symmetric')

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