How to find n values before and after a maximum of an array

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Coryn Melissa LLamoza Carabali
评论： Ameer Hamza 2020-10-16
Hi, everybody, new to Matlab. I want to be able to locate the maximun peak which is known(always at 1) and to be able to extract the data right before and after this maximun peak(see example on figure). And this should be done even if the max-peak value changes along the x-as. Please help :(
  2 个评论
Mathieu NOE
Mathieu NOE 2020-10-15
hello
use the "findpeaks" function to localise the peak signal position (index)
from this index value you can easily define a lower index = peak_index - 10 and an upper index = peak_index + 10
and generate an extract of your signal : signal_extract = signal(lower index : upper index)
good luck
Coryn Melissa LLamoza Carabali
Coryn Melissa LLamoza Carabali 2020-10-16
Hi, thank you for your answer. Is 'signal' a function? it doesn't seem to work :(

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Ameer Hamza
Ameer Hamza 2020-10-15
编辑：Ameer Hamza 2020-10-15
Something like this will work
x; % array of x-values
y; % array of y-values
[max_y, max_idx] = max(y);
x_max = x(max_idx);
interval = 0.02; % length of interval before and after peak
idx = (x_max-interval < x) & (x < x_max+interval);
x_interval = x(idx);
y_interval = y(idx);
x_interval and y_interval contain values in around the peak.

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