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Determine when the graph becomes flat

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LB
LB 2016-10-5
评论： LB 2016-10-6
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 :)

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Jan
Jan 2016-10-5
lastSteepIndex = find(diff(y) >= limit, 1, 'last')
Now you have the index of the last element with non-flat data.

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