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**Feigenbaum Interation**

This is the famous Feigenbaum iteration. The function is f(x)=a*x*(1-x),
and the start point of the iteration x(n+1)=f(x(nn) can be set with the mouse.
The parameter a can be changed with a slider. For large a the behavior is
chaotic. Otherwise there finitely many fixed points the iterations cycles
through.

### Technical Information

The iteration is performed with a macro, of course. Do not
make the mistake to evaluate the function by intersecting a line and the graph.
This is much slower.