R help - Aug 2011 - sum of two lists

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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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
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>


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

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