Phase Portrait

Next we plot the rabbit and fox populations against one another in what is called a PHASE PORTRAIT. We do this for two different initial conditions. Can you identify which curve goes with which initial condition? How is the independent variable t showing up in these pictures? (Hint: try it again with time interval t = 0 .. 20, or use the option arrows = SLIM.)

> DEplot( MODEL, vars, domain, [ init2, init3 ], stepsize=0.5, scene=[R,F], linecolor = [ maroon, black],

> title = `Rabbits vs. 100 * Foxes for t = 0 .. 380`, arrows= NONE);

>