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Find slope signal change

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Happy Bear
Happy Bear on 12 Aug 2020
Answered: Star Strider on 12 Aug 2020
Hello, I have this graph and I want to find out when does the slope changes from negative to positive around index ~100, for each group (younger and older), using polyfit.
Each line in the plot is a matrix column (ignore the shaded area, that's the standard error of the mean).

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