Re: [Maxima-discuss] Problem with draw2d(implicit(...))

[Gunter K. <gu...@pe...>]

On 20.03.20 22:09, Michel Talon wrote:
>
> Le 20/03/2020 à 21:25, Gunter Königsmann a écrit :
>> I am no mathematican. But might the implicit draw have actually found
>> and displayed a solution, but not the trivial one?
>>
> I don't think so, it should display several curves passing through or
> starting
> from (0,0)  like i show in the other plots (the spike here is due to
> reality conditions)
> while it shows nothing in a vicinity of (0,0).
>
draw3d(
    contour='map,key="curve",
    explicit(
        2*x^5-x^3*y+2*x^2*y^2-x*y^3+2*y^5,
        x,-.2,.2,
        y,-.2,.2
    ),
    grid=true
)$

seems to acknowledge that.

For some reason I need to define a key in order to get a legend for the
plot. Don't know if that is bug or a feature, though.