Polyhedron.radius() bug?

[rickhg12hs]

"Return the maximal distance from the center to a vertex."

Shouldn't this be translation invariant? Doesn't seem like any of
these are answers right.


sage: sq=polytopes.n_cube(2)
sage: sq.vertices()
[[1, 1], [-1, 1], [1, -1], [-1, -1]]

sage: sq.radius()
2*sqrt(2)

sage: Polyhedron([[p0+1,p1] for p0,p1 in sq.vertices()]).radius()
2*sqrt(3)
sage: Polyhedron([[p0+10,p1] for p0,p1 in sq.vertices()]).radius()
2*sqrt(102)

[Keshav Kini]

That looks obviously broken to me. I'll write a patch.

-Keshav

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[Anton Sherwood]

On 2012-2-10 05:27, rickhg12hs wrote:
> "Return the maximal distance from the center to a vertex."
>
> Shouldn't this be translation invariant?

Could 'center' here mean 'origin'? It's not obviously unreasonable to
assume that a polyhedron is defined so that they coincide.

--
Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang

[Keshav Kini]

Seems unlikely to me. The output does not match this theory either.

-keshav

achtung: sent from phone, possibly unduly terse

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[Keshav Kini]

Fixed this issue at http://trac.sagemath.org/sage_trac/ticket/12492 . Thanks for reporting this bug, rickhg12hs!