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chaintst.4
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1999-09-16
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chaintest(1) Scilab Function 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