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Question: Bug of  ChromaticNumber?

Question:Bug of  ChromaticNumber?

lcz 1029 Maple 2020
graphtheory
May 14 2020
0

I'd like to find chromatic number of some graphs. But I find a strange thing of function ChromaticNumber. 

with(GraphTheory):
g1:=Graph(4):
DrawGraph(g1);
ChromaticNumber(g1)

It is Ok!

But when I use following codes, an error will be issued.

with(GraphTheory):
graphsof4 := [NonIsomorphicGraphs(4, output = graphs, outputform = graph)]:
DrawGraph(graphsof4[1]);
ChromaticNumber(graphsof4[1]);
 

 

 

 

 
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