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MathGroup Archive 2012

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subgraph error (errata)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125816] subgraph error (errata)
  • From: dan jack <dan.spectrix at gmail.com>
  • Date: Wed, 4 Apr 2012 04:26:42 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

I write an errata for the previous message:

I obtain the error in this case:

gg = Graph[{11 -> 2, 11 -> 3, 4 -> 11, 5-> 11, 11 -> 11}]
Subgraph[gg, 1 ->_ ]

Join::headsd: Expression {11,2} at position 1 is expected to have head
List for all subexpressions through level 11.
DeleteDuplicates::list: List expected at position 1 in
DeleteDuplicates[Join[{11,2},{11,3},11]].

but not in this case:
gg = Graph[{1 -> 2, 1 -> 3, 4 -> 1, 5-> 1, 1-> 1}]

so it seems that the only difference is the vertex number: 1 works but
11 do not works ...very strange.

Obviously the arrows are the correct Directed Edges  (ESC de ESC)...

any help or solidarity comment is appreciated :-)



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