[R] How to union the elements in a list?

[Ben Bolker]

Peng Yu wrote:
> 
> Suppose that I have a list of vectors. I want to compute the union of
> all the vectors in the list. I could use 'for' loop to do so. But I'm
> wondering what would be a better solution that does not need a 'for'
> loop.
> 
> l=list(a=c(1,3,4), b=c(1,3,6), c=c(1,3,7), ....)
> 
> 

Reduce(union,l)

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