Having trouble with direction fields



Michael Carey wrote:
> When I do this:
>
> load("plotdf");
>
> plotdf(.5*(1-y/4)*y,[x,-2,6],[y,-2,6])$
>
> I do not get a graph, I am using wxmaxia, and graphs are working fine.
>
> Am I doing something wrong?
>
>   
Works for me with xmaxima and wxmaxima on windows with 5.20.1