Hi Peng,

Here is a suggestion:

unique(do.call(c, l))
# [1] 1 3 4 6 7

Best regards,
Jorge



On Wed, Oct 28, 2009 at 3:07 PM, 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), ....)
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

	[[alternative HTML version deleted]]


