From the above link, under the "Magic Wand" tool description, how does that algorithm work?

In RX, if I select the dominant (fundamental) frequency line, and then use the magic wand tool, it will give me the associated higher harmonics. My question is, what algorithm is that based on? How does that work? Especially considering that the magic wand is very fast, so it is using a fast algorithm.

I am trying to come up with a similar way of doing this in MATLAB, where the user will have a spectrogram and be able to select that line and then the program will do the rest of the work (like the magic wand tool) and find the associated harmonics, but I don't know how to do that.

Any ideas?


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