[R] adding up elements within a list

[Henrique Dallazuanna]

Try this:

sapply(intvl.period.myrs, sum)

On Tue, May 17, 2011 at 1:13 PM, Martin Hughes <M.Hughes at bath.ac.uk> wrote:
>
>
> Dear R users
>
> I have a list, as follows:
>
>> intvl.period.myrs
>
> $Devonian
> [1] 4.8 4.2 9.5 5.7
>
> $Ordovician
> [1]  7.2  5.1 10.2  1.9
>
> $Silurian
> [1] 4.7 3.0 7.8 2.0 3.3 1.6 2.6 2.7
>
>
> I want to write a loop that will sum up the values in each part, and give me
> a
> vector containing the (in this case 3) summed values
>
> this is what I have so far:
>
>                for (i in 1:length(names(intvl.periods.myrs)) {
>                        my.new.vector<-sum(intvl.periods.myrs[i] }
>
> This does not work and probably for obvious reasons.
>
> Thanks
> Martin
>
>
>
>
>
>
> --
> Martin Hughes
> MPhil/PhD Research in Biology
> Rm 1.07,  4south
> University of Bath
> Department of Biology and Biochemistry
> Claverton
> Bath    BA2 7AY
> Tel: 01225 385 437
> M.Hughes at bath.ac.uk
> http://www.bath.ac.uk/bio-sci/biodiversity-lab/hughes.html
>
> ______________________________________________
> R-help at 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