HDBSCAN, input: n×1 matrix, NullPointerException

[Fern-Parker]

@tgsmith61591 Hi. When HDBSCAN took as input a n×1 matrix, I met the following NullPointerException. But it works well with DBSCAN . The input was obtained by reading a csv file.
Exception in thread "main" java.lang.NullPointerException
at com.clust4j.algo.HDBSCAN.doLabeling(HDBSCAN.java:1327)
at com.clust4j.algo.HDBSCAN.getLabels(HDBSCAN.java:1592)
at com.clust4j.algo.HDBSCAN.treeToLabels(HDBSCAN.java:1643)
at com.clust4j.algo.HDBSCAN.fit(HDBSCAN.java:1356)
at com.clust4j.algo.HDBSCANParameters.fitNewModel(HDBSCANParameters.java:50)
Any help will be greatly appreciated!

[vbmacher]

This is a test case:

      double[][] pts = new double[][] {
        {39.3747, -120.032},
        {32.2699, -110.9853},
        {39.5111, -119.9575},
        {32.2699, -110.9853},
        {39.4725, -119.9981},
        {32.2699, -110.9853},
        {39.3885, -120.0248},
        {32.2699, -110.9853},
        {39.4725, -119.9984},
        {32.2699, -110.9853},
        {39.4731, -119.9977},
        {32.2699, -110.9853},
        {39.3769, -120.071},
        {32.2699, -110.9853},
        {39.389, -120.0248}
      };

Array2DRowRealMatrix matrix = new Array2DRowRealMatrix(pts);
new HDBSCANParameters(2).setMinClustSize(2).fitNewModel(matrix).getLabels

throws:

java.lang.NullPointerException
	at com.clust4j.algo.HDBSCAN.doLabeling(HDBSCAN.java:1327)
	at com.clust4j.algo.HDBSCAN.getLabels(HDBSCAN.java:1602)
	at com.clust4j.algo.HDBSCAN.treeToLabels(HDBSCAN.java:1653)
	at com.clust4j.algo.HDBSCAN.fit(HDBSCAN.java:1366)
	at com.clust4j.algo.HDBSCANParameters.fitNewModel(HDBSCANParameters.java:50)