On Wed, Nov 18, 2009 at 9:16 AM, Laurent <[email protected]> wrote:
> Hi.
>
> I'm writing the following code in order to plot sin(x^2+x^2) :
>
> var('x,y')
> g(x,y)=sin(x**2+y**2)
> plot3d(g(x,y),(x,-5,5),(y,-5,5))
>
> My problem is that the result is quite bad because of the sampling : all
> the points with x^2+y^2=pi/2 are not taken, so that I don't get
> beautiful circles.
>
> How can I ask for a finer sampling, or to compute more intermediate points ?
Use the plot_points option. Type "parametric_plot3d?" for more details:
- ``plot_points`` - (default: "automatic", which is
75 for curves and [40,40] for surfaces) initial number of sample
points in each parameter; an integer for a curve, and a pair of
integers for a surface.
Note that the documentation output by "plot3d?" doesn't even mention
the plot_points option, which is why you're confused. I've made an
enhancement ticket for this:
http://trac.sagemath.org/sage_trac/ticket/7488
William
-- William
> I'm sure there is an option to add, but I don't see in the documentation
> which one. (I'm reading the Sage reference manual, version 4.1.1, Agust
> 14 2009).
>
>
> Thanks for any help
> have a good noon
> Laurent
>
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--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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