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frozenset error when plotting polytopes: bug?

asked 2014-02-02 00:57:31 -0500

mf gravatar image

updated 2017-01-08 05:17:49 -0500

FrédéricC gravatar image

I am having trouble understanding an error I get, when i try the following:

ngon=polytopes.regular_polygon(122).dilation(18.1)
ngon.plot()

It says: KeyError: (frozenset([60]), frozenset([60])) The following works:

ngon=polytopes.regular_polygon(122).dilation(17.9)
ngon.plot()

What is going on? Is this a bug?

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i can reproduce this. If it helps you for the moment ngon=polytopes.regular_polygon(122).dilation(181/10) works.

marv gravatar imagemarv ( 2014-02-02 02:07:53 -0500 )edit

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answered 2014-02-03 09:56:03 -0500

Volker Braun gravatar image

Its basically this bug: http://trac.sagemath.org/ticket/10046

We don't have an arbitrary precision polytopes, so sooner or later numerical errors in floating point numbers will give you the wrong answer.

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Asked: 2014-02-02 00:57:31 -0500

Seen: 180 times

Last updated: Feb 03 '14