Duffing map
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![](http://upload.wikimedia.org/wikipedia/en/thumb/4/40/DuffingMap.png/220px-DuffingMap.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Tw_duffing.png/220px-Tw_duffing.png)
The Duffing map (also called as 'Holmes map') is a discrete-time dynamical system. It is an example of a dynamical system that exhibits chaotic behavior. The Duffing map takes a point (xn, yn) in the plane and maps it to a new point given by
The map depends on the two constants a and b. These are usually set to a = 2.75 and b = 0.2 to produce chaotic behaviour. It is a discrete version of the Duffing equation.
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