Try this:

as.list(colSums(merge(m, n, all = TRUE), na.rm = TRUE))

On Mon, Aug 29, 2011 at 7:39 PM, zhenjiang xu <zhenjiang.xu@gmail.com>wrote:

> Hi R users,
>
> Suppose I have two lists and the names of list 'm' are a subset of those of
> 'n', how can I sum the two lists with corresponding elements added together
> to get list 'o'?
>
> > n = list("a"=1,"b"=3,"c"=5)
> > m = list('b'=4)
> > o
> $a
> [1] 1
>
> $b
> [1] 7
>
> $c
> [1] 5
>
> Thanks
>
> --
> Best,
> Zhenjiang
>
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>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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