how to detect point before it went on plateau

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Sharah 2014-6-16

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回答： Star Strider 2014-6-16

dataforce.mat

Hello everyone, I am new to matlab and I am doing a force analysis. I would like to detect a point in matlab before it went on a plateau, for example, this picture below (taken from a journal)

but from my graph, i can only able to detect the peak point, not the plateau, example below

(top picture) i am not sure how to find the minimum point of plateau (green line graph) and the point until it start to go down again, and then plot a line through it, as well as label each point (tp, tr, tf). will somebody help me on this?

attached is my data for 3 forces and time.

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Image Analyst 2014-6-16

What is the algorithm described in the paper? Can't you just use the same method they did?

Sharah 2014-6-16

i don't think they use any specific algorithm, they just detect the point befre and after the plateau.

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Answer 1

Star Strider 2014-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/134657-how-to-detect-point-before-it-went-on-plateau#answer_141209

It looks as though the ‘LC Green’ signal is what you want. You might have to filter it first to eliminate the noise, but then I would take its derivative and test for the derivative being close to zero. That should approximately define the start and end points of the plateau.