How to get the spectral coherence function in this formula at MATLAB?

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Yihan Ma on 20 May 2019

The figure in below is the formula to calculate the spectral coherence function (3),

I could use other guys code to calculate the data Sx, that is, shown in function (1),

but I am confused about how to realize the frequency shift shown in the denominator of function (3)?

The code is attached.

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