How to find the changing point in figure?

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ADNAN KIRAL
ADNAN KIRAL on 18 Nov 2021
Commented: ADNAN KIRAL on 18 Nov 2021
Dear,
I have the data (a simple script is attached here for the plotting).
I want to find where it starts to change (slope of the line). I.e. I want to know the point of yielding in line. As you can see from the image, it is linear up to some point, but later the slope starts to change. How can I find the first changing point (just before a new slope) in my data,
Thanks for your help.
Regards,
load test12F.txt;
load test12D.txt;
D= test12D(:,3);
M= test12F(:,3)
figure; plot(D,M)

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