This question concerns the package GraphTheory
( Maple 2015 on a Windows 7 PC )
Let G1 be some graph and V a list of vertices in G1
The default colors DrawGraph uses for the vertices is yellow
I define the graph G2 this way :
G2 := copy(G1):
HighlightVertex(G2, V, red);
Obviously the result is a graph where vertices in V are red while the remaining ones are still yellow
Question 1 : Why does the command DrawGraph(G1) returns exactly the same picture ?
I have thought that defining G2 as a copy of G1 would have preserved the default colouring of the vertices.
Note that the same undesired (at least for me) thing occurs with the HighlightEdges command.
Question 2 : Is it possible to retrieve the original colouring of G1 without using HighlightVertex(G1, V, yellow) ?
Thank you in advance