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VertexAdd seems to forget EdgeWeight values

  • To: mathgroup at
  • Subject: [mg119478] VertexAdd seems to forget EdgeWeight values
  • From: Julian Francis <julian.w.francis at>
  • Date: Sun, 5 Jun 2011 07:05:12 -0400 (EDT)

Dear all,

It seems that when you add a vertex to a graph with EdgeWeight's, that
the old edge weights are not carried over to the new graph. Is this a

graph1 = Graph[{1, 2}, {1 \[DirectedEdge] 2}, EdgeWeight -> {5}];

In[557]:= PropertyValue[{graph1, 1 \[DirectedEdge] 2}, EdgeWeight]

Out[557]= 5

In[562]:= graph2 = VertexAdd[graph1, 6];

In[560]:= PropertyValue[{graph2, 1 \[DirectedEdge] 2}, EdgeWeight]

Out[560]= $Failed


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