On 03/12/2010 03:51 AM, Marshall Hampton wrote:
> One option is several implicit plots, colored by value, i.e. something
> like:
>
> var('x,y,z')
> f=cos(x)*cos(y)+cos(y)*cos(z)+cos(z)*cos(x)
>
> imps = []
> plot_range = srange(0,3,.75)
> color_range = [i/N(len(plot_range)) for i in range(len(plot_range))]
>
> for i,q in enumerate(plot_range):
> red = color_range[i]
> imps.append(implicit_plot3d(f-q==0, (x, -2, 2), (y, -2, 2), (z,
> -2, 2), opacity = .5, rgbcolor = (red,0,1-red)))
>
> show(sum(imps))
>
If you didn't need them to be plotted by color, then you could use the
contour option, like in the doc examples:
sage: implicit_plot3d((x^2 + y^2 + z^2), (x, -2, 2), (y, -2, 2), (z, -2,
2), plot_points=60, contour=[1,3,5])
Jason
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