[R] Union of list elements

[Liaw, Andy]

Initialize the list with the first vector, instead of an emtry list, if you
can.

Andy

> From: Patrick Meyer
> 
> Thank you Gabor.
> 
> But I have a problem with the beginning of my algorithm, 
> where the list 
> you call L is empty... then the code breaks down... It says:
> 
> "Error in any(...,na.rm = na.rm) : incorrect argument type"
> 
> How can I handle this?
> 
> Thank you very much for your help
> 
> Patrick
> 
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