How to obtain peaks in the y-axis above a reference line in matlab plot
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I want to get all the pnts in yaxes for a matlab plot above reference line -70 db
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KSSV
2018 年 6 月 13 日
Let x,y be your data. And reference line is at y = y0. To extract data above y = y0:
idx = y>=y0 ;
x1 = x(idx) ;
y1 = y(idx) ;
Star Strider
2018 年 6 月 13 日
If you have the Signal Processing Toolbox, use the findpeaks (link) function, and the 'MinPeakHeight' (and perhaps also the 'MinPeakDistance') values set to the appropriate thresholds. For 'MinPeakHeight that would be either -70 if your original data are in dB, or 3.162277660168379e-04 otherwise. You will have to experiment to get the correct 'MinPeakDistance' value.
If you do not, and you have R2017b or later, use the islocalmax (link) function. You will first have to threshold your data to present data only greater than -70 dB. Again, you will have to experiment to get the results you want.
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