Direction Field, Phase Portrait, and Solution Curves ( DEplot3d )
Replace the question marks ( %? ) in the following input regions to create the direction field for your model.
> DOMAIN := t = 0 .. 1 ;
> WINDOW := x = -20 .. 20,
> y = -25 .. 25;
>
> DIRplot := DEplot( MODELa, VARa, DOMAIN, WINDOW,
> arrows=THIN, scene=[ x, y ],
> title = `Phase Portrait for Linearized Lorenz System` ):
> DIRplot;
>
>