code: protected void aggregateEntry(Entry other, long currentTime,
              double negLambda) {
          this.data.aggregate(other.data, currentTime - this.timestamp,
                  negLambda);
          this.timestamp = currentTime;
      }
docs: Aggregate the <code>data</code> in the <code>Kernel</code> of the other
  <code>Entry</code>.
  @param other The <code>Entry</code> to be aggregated.
  @see #data
  @see Kernel