How to find the point in a plot that indicate to the beginning of a curve?
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Dear all,
I have a two dimension plot X, Y as shown in the attached image below. X and Y are linearly increase together, however at some point X will increase but y will not increase, and this simply will cause a curve in the plot.
My question is how to find the point X that indicate the beginning of the curve in the plot?
Any help will be appreciated.
Meshoo
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Answers (1)
Mischa Kim
on 24 Sep 2014
Edited: Mischa Kim
on 24 Sep 2014
Meshooo, you could use something like
x = 0:0.1:10;
y = sin(x);
plot(x,y)
xp = min(x(diff(y)<0))
diff computes the differences in array elements, sort of the first derivative of y. xp therefore marks the first x for which the derivative of y is negative.
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