I think I may have figured out what you _might_ have meant. An example would have speeded this process up considerably. Try: apply(mtx, 2, function) # perhaps within the MyFunc ... that you also did not provide. -- David. On Mar 18, 2010, at 10:03 AM, ManInMoon wrote: > > I am trying to un-c... -- David Winsemius, MD West Hartford, CT