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elki-project / elki

ELKI Data Mining Toolkit
https://elki-project.github.io/
GNU Affero General Public License v3.0
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EuclideanRStarTreeKNNQuery NPE #47

Closed neilireson closed 6 years ago

neilireson commented 6 years ago

Possibly related to https://github.com/elki-project/elki/issues/46.

NPE thrown, I think because I only have a single data point in the data set.

java.lang.NullPointerException
    at de.lmu.ifi.dbs.elki.index.tree.spatial.rstarvariants.query.EuclideanRStarTreeKNNQuery.expandNode(EuclideanRStarTreeKNNQuery.java:105)
    at de.lmu.ifi.dbs.elki.index.tree.spatial.rstarvariants.query.EuclideanRStarTreeKNNQuery.getKNNForObject(EuclideanRStarTreeKNNQuery.java:87)
    at de.lmu.ifi.dbs.elki.index.tree.spatial.rstarvariants.query.EuclideanRStarTreeKNNQuery.getKNNForObject(EuclideanRStarTreeKNNQuery.java:56)
    at de.lmu.ifi.dbs.elki.index.tree.spatial.rstarvariants.query.RStarTreeKNNQuery.getKNNForDBID(RStarTreeKNNQuery.java:94)
    at de.lmu.ifi.dbs.elki.algorithm.clustering.hierarchical.AbstractHDBSCAN.computeCoreDists(AbstractHDBSCAN.java:110)
    at de.lmu.ifi.dbs.elki.algorithm.clustering.hierarchical.HDBSCANLinearMemory.run(HDBSCANLinearMemory.java:116)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at de.lmu.ifi.dbs.elki.algorithm.AbstractAlgorithm.run(AbstractAlgorithm.java:87)
    at de.lmu.ifi.dbs.elki.algorithm.clustering.hierarchical.HDBSCANLinearMemory.run(HDBSCANLinearMemory.java:79)
    at de.lmu.ifi.dbs.elki.algorithm.clustering.hierarchical.extraction.HDBSCANHierarchyExtraction.run(HDBSCANHierarchyExtraction.java:129)
    at uk.ac.shef.wit.active10.CreateStaypoints.cluster(CreateStaypoints.java:707)
    at uk.ac.shef.wit.active10.CreateStaypoints.main(CreateStaypoints.java:1151)
kno10 commented 6 years ago

This indicates a construction problem for a one-point R-tree. I will have a look.