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Find slope signal change

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Happy Bear
Happy Bear 2020-8-12
回答： Star Strider 2020-8-12
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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回答（2 个）

Star Strider
Star Strider 2020-8-12
The ischange function (introduced in R2017b) is helpful here.
KSSV
KSSV 2020-8-12

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