code: static double[] extents(final List<Vector2d> vectors) {
          final int n = vectors.size();
          final double[] extents = new double[n];
          for (int i = 0; i < n; i++)
              extents[i] = VecmathUtil.extent(vectors.get(i));
          return extents;
      }
docs: Obtain the extents for a list of vectors.
  
  @param vectors list of vectors
  @return array of extents (not sorted)
  @see #extent(javax.vecmath.Vector2d)