chaintest(1)

NAME
chaintest - a three-species food chain model

CALLING SEQUENCE
chaintest([f_l,b1,odem,xdim,npts])

PARAMETERS

odem,xdim,npts
    : See portr3d

DESCRIPTION
Phase portrait of a three-species food chain model given by:
	ff1= f1(x(1))
	ff2= f2(x(2))
	xdot1= x(1)*(1-x(1)) - ff1*x(2)
	xdot2= ff1*x(2) -  ff2*x(3) - 0.4*x(2)
	xdot3= ff2*x(3) - 0.01*x(3)
and
	f1(u)=5*u/(1+b1*u)
	f2(u)z2=0.1*u/(1+2*u)
The default value for b1 is 3.0.

The Scilab macros chain(t,x),f1(u),f2(u) code the dynamical system

SEE ALSO
portr3d,ode