Versions 10.0-10.2 seem to have a bug when trying to set VertexCoordinates twice on a graph (version 9.0 is fine). Can you confirm it? What is a good workaround that will not discard any other attached properties/attributes such as weights?

g = RandomGraph[BarabasiAlbertGraphDistribution[10, 1]]    

(* set coordinates: *)
g = SetProperty[g, VertexCoordinates -> RandomReal[1, {10, 2}]]

(* trying to change them to something else fails *) 
g = SetProperty[g, VertexCoordinates -> RandomReal[1, {10, 2}]]

enter image description here

This related post describes a problem with RemoveProperty: I can't even remove the coordinates.

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    $\begingroup$ A workaround is the following: MapIndexed[(g = SetProperty[{g, First@#2}, VertexCoordinates -> #1]) &, RandomReal[1, {10, 2}]] $\endgroup$ – Patrick Stevens Sep 9 '15 at 7:41
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    $\begingroup$ @PatrickStevens There are some problems with this: 1. It only works after VertexCoordinates has been already set once. 2. First@#2 should be Extract[VertexList[g], #2]& to deal with situations where the vertex index does not equal the vertex name. But this works: SetProperty[g, VertexCoordinates -> Thread[VertexList[g] -> RandomReal[1, {10, 2}]]]. $\endgroup$ – Szabolcs Sep 9 '15 at 7:59
  • $\begingroup$ @PatrickStevens I'm confused. The documentation does seem to say index but for me it only works when I used the vertex name. $\endgroup$ – Szabolcs Sep 9 '15 at 8:16
  • $\begingroup$ I'm out of my depth here, I'm afraid. I don't have a consistent mental model for how the Graph stuff works. $\endgroup$ – Patrick Stevens Sep 9 '15 at 8:17
  • $\begingroup$ @PatrickStevens That's probably because the Graph stuff is not as consistent as the rest of Mathematica. $\endgroup$ – Szabolcs Sep 9 '15 at 9:17

A possible workaround is

SetProperty[g, VertexCoordinates -> Thread[VertexList[g] -> RandomReal[1, {10, 2}]]]

Instead of just giving a list, we must provide a list of rules assigning coordinates to each vertex name.


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