func_coherence.m

This m-function computes coherence and phase at the same time.

Description

This very simple m-function computes cross spectrum, coherence and phase at the same time. The input parameters are equivalent to pwelch.n or csd.m in MATLAB and use csd.m in the singal toolbox.

It's very simple but useful for engineers.

• Required Products: Signal Processing Toolbox
• MATLAB release: MATLAB 6.5 (R13)

[A Zaki]

Good program..

[Philip Orton]

I agree. Simple, but just what I was looking for, since I wasn't aware of how to compute phase. A minor improvement would be to allow the user to ignore the filt and n_overlap inputs, just as one can do with the csd.m function.

[Vitaliy Marchenko]

check it with two aboslutely identical sinusoidal waves of any frequenciy (let say) - 50 hz ... - and you will be surprized... - it doesn't work as Matlab standart function - 'cohere' or 'mscohere'(for version 7.0)

[Jon Fram]

I got it to produce the same output as mscohere by replacing csd with cpsd. I also wasn't clear how to calculate phase. func_coherence.m makes that clear to me. Thanks.

[j p]

 

[jan pospisil]

 

[k walker]

This is indeed nice, but it would have been better if it showed exactly how cpd's were calculated. Curse matlab for hiding such details.