protected void transfer(final WritableDataStore<Meta> metas,Meta meta,ModifiableDBIDs src,ModifiableDBIDs dst,DBIDRef id,int dstnum){
  src.remove(id);
  dst.add(id);
  meta.primary=dstnum;
  metas.put(id,meta);
}

protected void transfer ( final WritableDataStore < Meta > metas , Meta meta , ModifiableDBIDs src , ModifiableDBIDs dst , DBIDRef id , int dstnum ) { src . remove ( id ) ; dst . add ( id ) ; meta . primary = dstnum ; metas . put ( id , meta ) ; }
transfer a single element from one cluster to another .
