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MathGroup Archive 2010

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Relationship between vertices and indices with GraphDistanceMatrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111500] Relationship between vertices and indices with GraphDistanceMatrix
  • From: "Jon Harrop" <usenet at ffconsultancy.com>
  • Date: Tue, 3 Aug 2010 06:40:25 -0400 (EDT)

Given a graph represented as edges between vertices, such as the following:

g = {"1" -> "2", "1" -> "10", "1" -> "11", "2" -> "3", "2" -> "18",
  "3" -> "4", "3" -> "12", "4" -> "5", "4" -> "19", "5" -> "6",
  "5" -> "13", "6" -> "7", "6" -> "20", "7" -> "8", "7" -> "14",
  "8" -> "9", "8" -> "16", "9" -> "10", "9" -> "15", "10" -> "17",
  "11" -> "15", "11" -> "12", "12" -> "13", "13" -> "14",
  "14" -> "15", "16" -> "20", "16" -> "17", "17" -> "18",
  "18" -> "19", "19" -> "20"}

You can use GraphDistanceMatrix to compute the all-pairs shortest paths as a 
matrix. However, without knowledge of the mapping from vertex names to 
indices in the resulting matrix, the output is useless. So how are you 
supposed to use this function?

-- 
Dr Jon Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com 



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