Peak value on plot graph

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Reff
Reff 2020-1-15
评论： Star Strider 2020-1-16
y=a1(:,1);
chan1= y-mean(a1);
fs=128;
d=1/fs;
t=[0:length(chan1)-1]*d;
fs=fft(chan1,128);
pp=fs.*conj(fs)/128;
ff=(2:9)/128/d;
figure(4);
plot(ff,pp(2:9));
title('Power Spectrum');
xlabel('Frequency(Hz)');
ylabel('Power Spectrum Density(µv)');
grid on;
Peak.jpg
How to find peak value on y-axis without using Data Cursor tools. Thanks in advance.

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采纳的回答

Star Strider
Star Strider 2020-1-15
If you have R2017b or later, you can use the islocalmax function.
If you have the Signal Processing Toolbox, you can use the findpeaks function.
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Reff
Reff 2020-1-16
Hi Strider,
It works well. Really aprreciate it. Thanks.
Star Strider
Star Strider 2020-1-16
As always, my pleasure!

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