Determine when the graph becomes flat

Hi! I have a set of x and y-data which I have plotted in a diagram. I want to find a way to plot a horizontal line in my diagram when my graph (y-values) becomes flat for increasing x, i.e. when y(n+1)-y(n) is less than some number.

Is there a way I can do that using a loop or something? I appreciate all your help :)

Answer 1

[Jan]

lastSteepIndex = find(diff(y) >= limit, 1, 'last')

Now you have the index of the last element with non-flat data.

[LB]

Thank you, this was very useful!