meanfreq Command in Matlab

What is the code behind the meanfreq command. I understand how to calculate the meanfrequency; however, it is unclear to me how the graph with the meanfreq command is created.

[jen Magnes]

I figured out how to look at the original code using the 'edit' command.

[Rik]

My warning below still applies. Additionally, if you edit internal functions, your code becomes unshareable because the behavior is different from the original that others will have.

[jen Magnes]

Thank you, I understand. Can you tell me the math behind the 'meanfreq' plot? MatLab is not clear here at all.

[Rik]

I thought you said you understood the method? Anyway, the actual implementation might be different for each release as the Mathworks team optimizes their functions. It is not my area of expertise, and I don't think this forum would be suited for that question anyway.

Also, could you please mark my answer as accepted answer?

[jen Magnes]

As I said, I understand how mean frequency is estimated; nevertheless there are different methods. Which method is MatLab using?

Answer 1

[Rik]

With some functions, you can take a look at the underlying code with the edit command. You're in luck: meanfreq is such a function. This will help you open the function:

edit meanfreq

WARNING: do NOT edit any Mathworks function and don't replace the files. If you want something different from a provided function, save the edited code under a different name. Not doing so might lead to crashes and other unexpected behavior. Note that copying code under some circumstances might not be legal, as I would expect these functions to be copyrighted.

Answer 2

[jen Magnes]

If you look back, I said that I understand how to calculate the meanfreq - that is a single number. I don't understand how the graph using the meanfreq is calculated.

Answer 3

[jen Magnes]

What method does 'meanfreq' use to calculate the psd?

Answer 4

[jen Magnes]

Nevermind. I figured it out.