public synchronized void sortBy(int dim)
	{
		if((dim<1)||(dim>dimensions)) throw new java.lang.IndexOutOfBoundsException();
		dim--;
		if(stuff!=null)
		{
			final TreeSet sorted=new TreeSet();
			Object O=null;
			for (final Object[] name : stuff)
			{
				O=(name)[dim];
				if(!sorted.contains(O))
					sorted.add(O);
			}
			final SVector<Object[]> newStuff = new SVector<Object[]>(stuff.size());
			for(final Iterator i=sorted.iterator();i.hasNext();)
			{
				O=i.next();
				for (final Object[] Os : stuff)
				{
					if(O==Os[dim]) newStuff.addElement(Os);
				}
			}
			stuff=newStuff;
		}
	}