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On Thu, Nov 5, 2009 at 1:59 PM, Doug Rogers wrote:
> Well, you've inspired me to do some crazy coding. I use the __call
> metamethod on a tensor (matrix of possibly more dimensions) to return an
> element-reference object whose own __call metamethod allows access to
> the element. I also provide set() and get() functions may be used for
> the element-reference object. Finally, just for fun, I overload __index
> and __newindex to get or set the element, but that requires a dummy index
> ...
> local _ = true   -- Can be anything except nil.
> p(1,2,3)[_] = 123
> print(p(1,2,3)[_])

This variant would be preferable:

  p(1,2,3).v = 123

Something like that is actually done when scripting Excel:

  ws.Cells(1, 2).Value = y