r(t+1)=r
x(t+1)=r*x*(1-x)
y(t+1)=y+log(abs(r*(1-2*x)))
aux z=y/(t+1)
init x=.123456,r=3
@ total=5000,trans=5000,meth=disc
@ xp=r,yp=z,xlo=2,xhi=4,ylo=-1,yhi=1
done