removing of a 'three point' spike

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Binu 2021-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/769192-removing-of-a-three-point-spike

评论： Mathieu NOE 2021-3-12

Hi ,

I have a time series with a few spikes. A spike, in general, is a one point outlier. But as the attached image, one of the spikes in the data set is with three points. So it is not ditected by 'findpeaks'. Can anyone have an idea of how I can remove these three points.

Thank you

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Binu 2021-3-12

Hi Mathieu,

The noise is my data. I am worring only about the isolated spikes. Out of those, the '3 points' one (shown by the red arrow) that I want to get rid of. There are quite a few of those 3point spikes in my data set, so I really need to improve the script to find them rather than find and replace them one by one.

Thank you

Mathieu NOE 2021-3-12

tx for the clarification

I think I have an idea : I would use one the smoothing (or enveloppe) function to create a "baseline" and then make a test condition to find all spikes above this line + slight vertical offset. If any of those point are 3 contiguous points , bingo !

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