Example #1 -- Decoupled System
> ode1 := diff( x(t), t ) = -x(t);
> ode2 := diff( y(t), t ) = -2*y(t) ;
> MODEL := { ode1, ode2 } ; # define the differential equation model
> VAR := { x(t), y(t) } ; # identify the variables in the model in the form h(t), u(t)
>
Direction Field and Phase Portrait ( DEplot )