I want to analyze falling limb of a time series by pulling out the values associated with the red dots

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Angela Bowman 2015-6-19

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关闭： MATLAB Answer Bot 2021-8-20

I want to analyze the falling limb of a time series where I: 1) pull out the red values (inflection points on a falling limb over time) and 2) create a new plot where all falling limbs are plot together and then a regression curve is fit to the data. I have the time series data and I am assuming I need to write a loop that finds the values associated with the red dots (val1) where first value (y)>next inflection and last value (m)<next inflection. I only want those red dot values that are >5. I'm not sure how to do this!

Angela

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Answer 1

Image Analyst 2015-6-20

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You might try findpeaks() in the Signal Processing Toolbox. I'm not sure what you mean by inflection points, but it looks like you're getting all data points from the peak, going down the right side of the peak, until it levels out or goes back up again. That should be easy to find using a simple for loop once each peak location is found.