why graph.degree returns less values than number of nodes

Asked Nov 27 '15 at 16:48

Active Nov 28 '15 at 13:58

Viewed 74 times

I have a graph in Spark using Graphx like:

val graph = Graph(users, rels)
println("number of vertices is " + graph.numVertices + " and number of edges is " + graph.numEdges)

and the result is:

number of vertices is 253 and number of edges is 228

I then .cache() the network and run:

val degrees = graph.degrees
// debug
println("done with degrees, I have " + degrees.count() + " degree values")

I end up having:

done with degrees, I have 112 degree values

So my question is: is there a reason why I don't have a degree result for every node in the graph?

asked Nov 27 '15 at 16:48

user299791

A verifiable example would great. – zero323 Nov 27 '15 at 19:33
Cannot share the dataset... But I understand correctly that degrees is supposed to report all nodes, even those with degree = 0? – user299791 Nov 27 '15 at 21:06
I didn't mean your real dataset :) No, it doesn't report nodes with zero degree. I guess this is the source of the problem. – zero323 Nov 27 '15 at 21:58
Yes that is the problem... So my problem is to map 0 for nodes that are not reported in degrees.... – user299791 Nov 28 '15 at 03:50

0 Answers0