extract data points where the slope (derivative) of the plot changes suddenly

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Ali
Ali 2023-1-23
编辑： Matt J 2023-1-23
Hi,
Is it possible to extract (or select) data points from a plot that have a massive change in the tangent (derivative) before and after them?
I mean the data points where the slope (derivative) of the plot changes suddenly.
I cannot do it manually because there are lots of data points.

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回答（1 个）

Matt J
Matt J 2023-1-23
编辑：Matt J 2023-1-23
Ran in:
data=[ 1 2 3 4 3 2 1]
data = 1×7
1 2 3 4 3 2 1
loc=abs(diff(data,2)) > 1
loc = 1×5 logical array
0 0 1 0 0
loc=[false, loc ,false]; %pad with zeros because diff() shortens the vector by two
data_extraction = data(loc)
data_extraction = 4

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