MATLAB Answers


Find sudden jumps in signal

Hussam Ibrahim さんによって質問されました 2018 年 2 月 12 日
最新アクティビティ Chris Turnes
さんによって コメントされました 2018 年 2 月 12 日
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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Chris Turnes
Answer by Chris Turnes on 12 Feb 2018
Edited by 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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Answer by 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 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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