MATLAB Answers

Find sudden jumps in signal

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Hussam Ibrahim
Hussam Ibrahim on 12 Feb 2018
Commented: Kayihan Cömert on 4 Dec 2019
Hello,
I have a recovery signal of cells post photobleaching, and I am trying to find an algorithm on Matlab where it detects sudden changes in signal (primarily sudden increases). Is there a custom MATLAB function for this? I found something called 'findchagespts', but in this one you have to mention how many changes you are expecting. I am also looking for an algorithm where it gives some statistics value of how much the change is.

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Answers (2)

Chris Turnes
Chris Turnes on 12 Feb 2018
Edited: Chris Turnes on 12 Feb 2018
If you have access to R2017b, try taking a look at the ischange function. The name-value pair 'Threshold' will let you tune a sensitivity to detecting changepoints, rather then specifying an explicit number of changepoints.

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Kayihan Cömert
Kayihan Cömert on 4 Dec 2019
With 'linear' method this finds all the changes regardless of if it increases or decreases. In his case and in my case, we are trying to find the just sudden increases or just sudden decreases.

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Hussam Ibrahim
Hussam Ibrahim on 12 Feb 2018
Thank you for your input. I think I have a license for the b version. I will install and run it to see if it makes a difference. Thank you.

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Chris Turnes
Chris Turnes on 12 Feb 2018
There is also a similar option in findchangepts called 'MinThreshold'. The notes at the bottom of the documentation page discuss the exact mathematical meaning of this option.

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