[Maxima] plot2d -range

[Adam Majewski]

Hi

I want to draw list complex points on the screen.
I do it with procedure which computes and draws points.

draw_centers(p):=block( P(n):=if n=0 then 0 else P(n-1)^2+c, 
r:allroots(P(p)), rec:makelist(realpart(rhs(r[i])),i,1,length(r)), 
imc:makelist(imagpart(rhs(r[i])),i,1,length(r)), 
plot2d([discrete,rec,imc],[gnuplot_curve_styles, ["with points"]]) )

But I would lika to draw points on the same horizontal and vertical range.
adding [x, -2.5,2.5],[y,-2,2] does not work.
What can I do ?

Adam Majewski
fraktal.republika.pl