Segmenting data based on multiple min and max value

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az 2019-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/468016-segmenting-data-based-on-multiple-min-and-max-value

评论： az 2019-6-20

ab.xlsx

Hello, I have the following xlsx file (x,y). I want to separate every section of the curve ( 4 downard, 4 upward) part separate data file so that I can plot as different curve and merge them. So could anyone please suggest, how can I do segmentation based on multiple minima or maxima.

Thank you

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infinity 2019-6-20

Hello,

Here is my idea.

First, we can sort the data such that x increases from 0 to 3 if your data have not already been sorted.

Then, we find the maximum value of y for x > 1 if we did not know it.

To find the maximum of y for x within [1 3], you can just

store your data with another varibale, let say "temp", in which x > 1.
use max fucntion for "temp"

When you have this value, you can use "for" and "if" to split what you want.

Best regards,

Trung

az 2019-6-20

Thanks Trung, the problem is not all my other data that I have goes a fixed minima like 0 or a fixed maxima, I have to segment data based on local min and max.

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