Hi,
When I add a 3d plot to a polyhedron plot, it doesn't just return a new plot
object but also changes the polyhedron plot. On the other hand, adding two 3d
plots does not change either of them. For example:
sage: x = var('x')
sage: y = var('y')
sage: plot1 = plot3d(x^2+y^2,(x,-2,2),(y,-2,2))
sage: plot2 = plot3d(x^2-y^2, (x,-2,2), (y,-2,2))
sage: plot3 = plot3 = Polyhedron(vertices = list(Permutations(3))).plot() #A
hexagon in 3-space (the 2d permutohedron)
sage: plot4 = plot3+plot1
sage: plot5 = plot2+plot1
After this, plot2 has not changed, but plot3 is now the union of a hexagon and
a paraboloid. Check it:
sage: plot2
sage: plot4
I assume this is a bug, but thought I would check before reporting it to trac.
Is this desired behavior?
(I'm using Sage 6.1.1.)
Thanks,
Robert
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