File: geisel.ode

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# an example due to Geisel with 1/f spectral properties
par a=1.5,b=.5
x'=u
y'=v
u'=(a+b*cos(y))*sin(x)
v'=(a+b*cos(x))*sin(y)
init x=-30,y=-50,u=1,v=.5
@ total=8000,dt=.25,maxstor=100000,bound=100000,meth=qualrk
done