code: public void addAll(ExampleSet data)
  	{
  		for (int i=0;i<data.size();i++)
  			add(data.x(i), data.y(i), data.id(i));
  
  	}
docs: Appends all of the elements in the specified example set
  to the end of this example set.
  
  @param data example set whose elements are to be added
  to this example set.