How many elements in this table?

[Eric Tetz <erictetz@...>]

Ugh, haven't used Lua in a year or so, then discovered I could script
the interface of my game with it (World of Warcraft).  Now I have what
feels like a newbie question:

How can I tell the number of elements in table T? I'm not using it as
a list, so table.getn always returns 0. Do I need to write something
like this?

function numelements (t)
  local n = 0
  for k,v in t do
    n = n + 1
  end
  return n
end

That seems very kludgey.