Phase Portrait & Solution Curve for
> IC1 := [ y(0) = 1, v(0) = -2 ] ;
>
> PHASEplot := DEplot( MODEL, VAR, DOMAIN, [ IC1 ], WINDOW,
> arrows=SLIM,
> scene=[ y, v ], linecolor=BLUE,
> title = `Phase Portrait for # 14(c): y1 = exp(-2t)` ):
> Yplot := DEplot( MODEL, VAR, DOMAIN, [ IC1 ],
> scene=[ t, y ], linecolor=BLUE ):
> Vplot := DEplot( MODEL, VAR, DOMAIN, [ IC1 ],
> scene=[ t, v ], linecolor=GREEN ):
> YVplot := display( [ Yplot, Vplot ], title=`Solution Curves for #14(c): y1=exp(-2t)` ):
> PHASEplot;
> YVplot;
>