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D.13.2.51 vertexAdjacencyGraph
Procedure from library polymake.lib (see polymake_lib).
- Usage:
- vertexAdjacencyGraph(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 adjacency graph of the vertices of p,
the intvec in position i contains all vertices j which are connected to vertex i via an edge of p.
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);
vertexAdjacencyGraph(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]:
==> 1,2,4,5
==> [2]:
==> 0,2,3,5
==> [3]:
==> 0,1,3,4
==> [4]:
==> 1,2,4,5
==> [5]:
==> 0,2,3,5
==> [6]:
==> 0,1,3,4
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