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On Sun, 31 Jan 2010, Kuang Chen wrote:

>       I am encountering this error "attempt to concatenate a userdata
> value" when I am trying to write a tostring metamethod for userdata
> "realvector". This is what the function looks like:

Nothing jumps out immediately.  If you could post a small 
self-contained example of the problem which we can run, then than 
would go a long way towards being able to help you.