Are you guys implying this is a natural fix? The behavior I see is a
bug, in my opinion. I don't want 500 contours for what I am doing.
Thanks for taking a look!
-M. Hampton
On Oct 14, 9:26 am, Jason Grout <[EMAIL PROTECTED]> wrote:
> William Stein wrote:
> > On Tue, Oct 14, 2008 at 8:07 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
>
> > If you replace 80 by 500 above then everything looks fine.
>
> You took the words right out of my mouth. However, that implicit plot
> comes up as a black ellipse for me (3.1.2 and 3.1.3rc0). I don't think
> it should be filled, though, as it should be a plot of x^2/4+y^2/9==1,
> not <=1. Is anyone else seeing that problem?
>
> Jason
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