EigenVector Centrality is giving null, if first node's degree is 0 #4847
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I reported it to the team, but if you have time and the means we would also be happy about a pull request. |
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…ted nodes Refactored EigenvectorCentralityPower and Arnoldi to use common abstract class. Issue neo4j#4847
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Issue solved by #5018 |
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Hi there,
I am using neo4j-graph-algo-2.2.2 library for EigenVector centrality. But, I guess there is a bug. For example, if your first node (or vertex) is not connected to others (degree is 0), the calculation is giving null exception. There is something with first node's degree.
Please help me
NodeID Degree
1 0
2 1
4 3
Exception in thread "main" java.lang.NullPointerException
at org.neo4j.graphalgo.impl.centrality.EigenvectorCentralityPower.runIterations(EigenvectorCentralityPower.java:180)
at org.neo4j.graphalgo.impl.centrality.EigenvectorCentralityPower.calculate(EigenvectorCentralityPower.java:126)
at org.neo4j.graphalgo.impl.centrality.EigenvectorCentralityPower.getCentrality(EigenvectorCentralityPower.java:93)
at neo4j.Neo4jEssentials.getEigenVectorCentralityForAllNodes(Neo4jEssentials.java:304)
at neo4j.ShortestPathTest.runEverythingResults(ShortestPathTest.java:124)
at neo4j.ShortestPathTest.main(ShortestPathTest.java:50)
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