[R] cumsum list..

[yoooooo]

Yes! mapply is awesome! Thanks. 


Gabor Csardi wrote:
> 
> cumsum( mapply(function(i,j) sum(a$data[i:j]), x, y) )
> 
> Is this what you want?
> Gabor
> 
> On Thu, Mar 13, 2008 at 06:02:13AM -0700, yoooooo wrote:
>> 
>> Hi all, i have the following.. 
>> 
>> a <- data.frame(data = seq(1,10))
>> 
>> i have indices:
>> x <- c(1, 5, 3, 9)
>> y <- c(2, 7, 4, 10)
>> 
>> I want the cumsum of a[1:2], a[5:7], a[3:4]... 
>> 
>> is there an elegant way to do it without any loop? Thanks!
>> 
>> -- 
>> View this message in context:
>> http://www.nabble.com/cumsum-list..-tp16025202p16025202.html
>> Sent from the R help mailing list archive at Nabble.com.
>> 
>> ______________________________________________
>> 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.
> 
> -- 
> Csardi Gabor <csardi at rmki.kfki.hu>    UNIL DGM
> 
> ______________________________________________
> 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.
> 
> 

-- 
View this message in context: http://www.nabble.com/cumsum-list..-tp16025202p16049054.html
Sent from the R help mailing list archive at Nabble.com.