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Extraction of a result in an other form

asked 2019-10-02 16:36:04 -0500

Cyrille gravatar image

For the following code

pol = Polyhedron(ieqs = [[5, -1/2, -1/4],[-18, 1, 3],[0, 1, 0],  [0, 0, 1]])

vr=pol.Vrepresentation()

vr

the result is

(A vertex at (0, 20), A vertex at (42/5, 16/5), A vertex at (0, 6))

How to have it as

pol= [(0, 20),(42/5, 16/5),(0, 6)] ?

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answered 2019-10-02 16:56:06 -0500

tmonteil gravatar image

As you can see, the returned elements are vertices, with their own methods, like the ability to provide its neighbors in the polyhedron.

sage: v = vr[0]
sage: v
A vertex at (0, 20)
sage: type(v)
<class 'sage.geometry.polyhedron.representation.Vertex'>

You can transform a vertex into a tuple as follows:

sage: tuple(v)
(0, 20)

So, to do that for each element of the list, you can just use list comprehension:

sage: [tuple(v) for v in vr]
[(0, 20), (42/5, 16/5), (0, 6)]
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Asked: 2019-10-02 16:36:04 -0500

Seen: 18 times

Last updated: Oct 02