From: landon donovan on
The ecuations for this problem are:

dx=m1*x + b1 + f1(y)
dy=m2*y + b2 + f2(x)

where:
/ -c1 if y<0
f1(y) = |
\ c1 if y>0


/ -c2 if x<0
f2(y) = |
\ c2 if x>0

and m1=m2=-0.9 b1=b2=0 c1=c2=0.5 for this case
Is there another way that is better for this system to be represented in matlab to use the ode solver???