File: delay.ode

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# delayed feedback delay.ode

# declare all the parameters, initializing the delay to 3
p tau=3,b=4.8,a=4,p=-.8
# define the nonlinearity
f(x)=1/(1+exp(-x))
# define the right-hand sides; delaying x by tau
dx/dt = -x + f(a*x-b*delay(x,tau)+p)
x(0)=1-t
init x=1
aux si=0
# set maxdelay
@ delay=20
# done
d