x-nullclines
The
-nullclines are found by setting the RHS of the first ODE equal to 0:
> factor( rhs(ode1) ) = 0 ;
The
-nullcline(s) typically consists of curves that can be expressed either as a function of
or as a function of
:
> xNULL1 := plot( ?, x = ? .. ?, color=GREEN ): # for a nullcline of the form y=F(x)
> xNULL2 := plot( [ ?, y, y = ? .. ? ], color=GREEN ): # for a nullcline of the form x=G(y)
> xNULLplot := display( [ xNULL1, xNULL2 ], axes=BOXED ):
> xNULLplot;
>