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D.13.2.55 vertexEdgeGraph

Procedure from library polymake.lib (see polymake_lib).

Usage:
vertexEdgeGraph(p); p polytope

Return:
list, the first entry is a bigintmat containing all vertices as row vectors, and therefore assigning all vertices an integer. the second entry is a list of intvecs representing the edge graph of the vertices of p, each intvec represents an edge of p connecting vertex i with vertex j.

Example:
 
LIB "polymake.lib";
==> Welcome to polymake version
==> Copyright (c) 1997-2015
==> Ewgenij Gawrilow, Michael Joswig (TU Darmstadt)
==> http://www.polymake.org
intmat M[6][4] =
1,1,0,0,
1,0,1,0,
1,0,-1,0,
1,0,0,1,
1,0,0,-1,
1,-1,0,0;
polytope p = polytopeViaPoints(M);
vertexEdgeGraph(p);
==> polymake: used package ppl
==>   The Parma Polyhedra Library (PPL): A C++ library for convex polyhedra
==>   and other numerical abstractions.
==>   http://www.cs.unipr.it/ppl/
==> 
==> [1]:
==> 1, 0, 0,-1,
==> 1, 0,-1, 0,
==> 1,-1, 0, 0,
==> 1, 0, 0, 1,
==> 1, 0, 1, 0,
==> 1, 1, 0, 0
==> [2]:
==>    [1]:
==>       0,1
==>    [2]:
==>       0,2
==>    [3]:
==>       0,4
==>    [4]:
==>       0,5
==>    [5]:
==>       1,2
==>    [6]:
==>       1,3
==>    [7]:
==>       1,5
==>    [8]:
==>       2,3
==>    [9]:
==>       2,4
==>    [10]:
==>       3,4
==>    [11]:
==>       3,5
==>    [12]:
==>       4,5