Find the value of x when the first derivative is equal to 0
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I have the data x, y (.mat version) from which I compute its first derivative as follows :
dy = diff(y)./diff(x);
I need to find the points (x, y) such that the first derivative is 0. (In this case, there should be 2 points)
I have tried with this code, but it doesn't work, it tells me "Second argument must be a vector of symbolic variables"
Any idea how to fix the problem?
Thanks in advance!