detect increse/decreases in time series data

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Vanessa 2018-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/405645-detect-increse-decreases-in-time-series-data

评论： jonas 2018-6-14

Hello everyone,

I have time series data of an engine power output as you can see in the picture. I want to find a way to detect the changes in load (increase/decrease) and the duration of these changes (how much time to increase and how much time of decrease). So I want something like time of start increasing,time of stop increasing, time of start decreasing , time of start decreasing. so I can calculate the durations.

Any idea woluld be helpful.

Thanks, Vanessa

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Answer 1

jonas 2018-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/405645-detect-increse-decreases-in-time-series-data#answer_324651

You can use the functions findchangepts, or ischange for time-series data, to detect abrupt changes in terms of slope or mean value.

Provide some data if you want more details

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Vanessa 2018-6-14

Thank you for your answer. I noticed that this function was introduced in MATLAB R2017b. Is there an alternative for older versions? Or another way to detect the changes?

jonas 2018-6-14