Examples of Graphical Analysis


In the pictures, red lines show graphical analysis, while black lines show the axes, the function f(x), and the diagonal line y = x.


Attracting Fixed Point: 0 on f(x) = x2
Nearby point: x0 = -.3 Nearby point: x0 = .4
Both nearby points are pulled closer to 0, the attracting fixed point.

Repelling Fixed Point: 1 on f(x) = x2
Nearby point: x0 = .75 Nearby point: x0 = 1.25
Both nearby points are push away from 1, the repelling fixed point.

Neutral Fixed Point: 0 on f(x) = x(1 - x)
Nearby point: x0 = -.3 Nearby point: x0 = .2
This point is pushed away from 0, the neutral fixed point. This point is pulled toward 0, the neutral fixed point.
The neutral fixed point, 0, is an example of a saddle. That is, it attracts in one direction and repels in another.


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