# Drawing Bifurcation diagrams for a dynamical system

1. Nov 13, 2012

### Phyrrus

1. The problem statement, all variables and given/known data[/b]
Consider the dynamical system
$\frac{dx}{dt}$=$r$$x$-$\frac{x}{1+x}$
where r>0
Draw the bifurcation diagram for this system.

2. Relevant equations

3. The attempt at a solution
Well fixed points occur at x=0,$\frac{1}{r}$-1 and x=0 is stable for 0<r<1 and unstable for all r>1
For the fixed point at $\frac{1}{r}$-1, however, it is stable when r-r$^{2}$<0

So how do I draw the non-zero bifurcation points? Thanks

2. Nov 14, 2012

### jackmell

Well, the bifurcation diagram is a diagram illustrating how the fixed points change as a function of the parameter. So you have two fixed points:

$$(0,\frac{1-r}{r})$$

So those change as a function of r right? Got two until r=1, got one there, then two again when r>1. Can you not just plot those two fixed points as a function of r? You can do that.