docs: public static double[] computeSimilarityMatrix(DependenceMeasure sim, Relation<? extends NumberVector> rel) {
      final int dim = RelationUtil.dimensionality(rel);
      // TODO: we could use less memory (no copy), but this would likely be
      // slower. Maybe as a fallback option?
      double[][] data = new double[dim][rel.size()];
      int r = 0;
      for(DBIDIter it = rel.iterDBIDs(); it.valid(); it.advance(), r++) {
        NumberVector v = rel.get(it);
        for(int d = 0; d < dim; d++) {
          data[d][r] = v.doubleValue(d);
        }
      }
      return sim.dependence(DoubleArrayAdapter.STATIC, Arrays.asList(data));
    }