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Finding multiple x-intercepts for a dataset

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I have a 2-D dataset that crosses the x-axis multiple times.
I would like help making a function that will return all the x values at which y = 0.
Any help for a day 1 newbie would be much appreciated!
Possibly helpful background: I'm analyzing sound spectra. I would like to find the peaks of the signal by finding where the 1st derivative crosses the x-axis.

Accepted Answer

William Rose
William Rose on 28 Jun 2021
Matlab has a very nice peak finding function, findpeaks(), help here: It has nice options, including threshold, minimum peak prominence, minimum horizontal (i.e. time or frequency, in your case) separation, etc.
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More Answers (1)

William Rose
William Rose on 28 Jun 2021
You said you have a 2D dataset. If you mean the spectrogram, the time dependent Fourier transform, then findpeaks() is not the right answer since it is for 1D signals.

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