# Properly initialize properties for vertices in a graph?

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 Lior Samuel 1 Vote Greetings!I am trying to define a new property on my graph, and I want it to set a base value for it. The docs file says I can use All as a parameter to apply a SetProperty command to all objects, but it doesn't work. minimal example is using: g = CompleteGraph[4] SetProperty[{g,All}, VertexStyle -> Red] returns: $FailedWhat am I missing here? I can try brute-forcing the SetProperty function across all the vertices in the graph, but is that the only option? It doesn't feel very wolframish.Thanks in advance!Lior Answer 9 days ago 3 Replies  Kapio Letto 1 Vote Use simply: SetProperty[g, VertexStyle -> Red] Not sure why All does not work. Answer 9 days ago  It worked! Feeling pretty silly right now for not trying this...Many thanks! Answer 9 days ago  Now I am having trouble defining custom properties. my code is g = CompleteGraph[4] g2 = SetProperty[g, "name" -> "shambalulu"] BreadthFirstScan[g2, { "DiscoverVertex" -> Function[{child, parent, deg}, { Print[PropertyValue[{g2, child}, "name"]], Print[PropertyList[{g2, child}]] }] } ] which works for VertexStyle->Red, but not for this case. running this code returns$Failed for each vertex's PropertyValue, and {VertexCoordinates,VertexShape,VertexShapeFunction,VertexSize,VertexStyle} for the PropertyList. So it seems like the SetProperty function failed silently for some reason, but here at 'user properties' and here at the basic examples it seems possible. I also tried this code: Property[g2, "name"-> "shambalulu"] but it didn't even work with vertexStyle, simply returning the Property relation as typed. Again, the goal is to create a custom property with a default value for all vertices, so specifying every vertex like in: Graph[{Property[1, "name" -> "shambalulu"], 2, 3}, {1 <-> 2, 2 <-> 3, 3 <-> 1}] is not good enough... Any ideas?