It appears this is caused somehow by implicit_plot; if I use
parametric_plot for the ellipse everything works normally.
-M. Hampton
On Oct 14, 10:07 am, Marshall Hampton <[EMAIL PROTECTED]> wrote:
> I am trying to do a demo for a class and I have encountered a strange
> and very annoying error (or I am missing something).
>
> If I do:
> {{{
> var('x,y')
> f = (x^2+y^2)^(.5)
> cp = contour_plot(f,(-3,3),(-4,4), fill=False, plot_points = 80, cmap
> = 'winter', contours=srange(2.9,3.1,.1))
> g = x^2/4+y^2/9-1
> gp = implicit_plot(g,(-3,3),(-4,4), plot_points = 80)
> pts = point2d([[0,3],[2,0],[-2,0],[0,-3]])
> show(cp+gp+pts,figsize = [7*3/4,7])}}}
>
> then the points with positive coordinates seem misplaced by about 1/10
> of a unit; they should be on the ellipse.
>
> -M. Hampton
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