I'm given a data set of over 7500 points (generated by an ECG) and I need to find all of the relative max and mins.

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Ryan Cabitac 2018-8-30

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关闭： MATLAB Answer Bot 2021-8-20

The data points are so close together that it increases and decreases with every data point and creates thousands of negligible changes. I need to single out the big changes. I am trying to use a method that will detect if a value at 'n' is greater than the previous 50 values and next 50 values. I do not want to write it out fully. i.e

if data(n) > data(n+1) && data(n+2) && ... && data(n+50)
  fprintf('true')
end

I would like to consolidate that into a more efficient line of code.

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Answer 1

Greg 2018-8-30

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Have you tried the islocalmin and islocalmax functions (introduced in R2017b)? Specifically, check out the option for 'MinSeparation' to limit how closely local extrema may be detected to each other.