Select samples from plot

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Miguel Albuquerque
Miguel Albuquerque 2022-6-10
回答： KSSV 2022-6-10
Hey to all, this is probably very easy, but im struggling with it, thanks in advance. I have the spectrum of a signal represented in the image above. I need to select samples from x axis(frequency) where y axis is superior to -140dB.
Basiccaly I want two things, select the samples from x where y is superior to -140 and select y samples where y is superior to -140. I was thinking of using the find function, right?

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KSSV
KSSV 2022-6-10
Let f be your x-axis i.e. frequency values and s be your y-axis i.e. specturm values.
idx = s > -140 ;
x1 = x(idx) ;
s1 = s(idx) ;

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