Finding multiple x-intercepts for a dataset
显示 更早的评论
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.
采纳的回答
William Rose
2021-6-28
1 个投票
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.
3 个评论
William Rose
2021-6-28
findpeaks() returns the peak amplitudes and the peak locations (i.e. frequencies, if analyzing a spectrum).
Jacob Hohsfield
2021-6-28
William Rose
2021-6-28
@Jacob Hohsfield, you;re welcome, and good luck on your work.
更多回答（1 个）
William Rose
2021-6-28
1 个投票
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.
See this quesiton and answer: https://www.mathworks.com/matlabcentral/answers/399125-how-can-i-find-the-peaks-of-a-surface-i-e-2-d-data-instead-of-1-d
类别
在 帮助中心 和 File Exchange 中查找有关 Descriptive Statistics 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
