Re: [R] cumsum list..

From: yoooooo <magno_yu_at_ml.com>
Date: Fri, 14 Mar 2008 11:32:41 -0700 (PDT)

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.
>>
>> ______________________________________________
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>> PLEASE do read the posting guide
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>> 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.
> 
> 

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Received on Fri 14 Mar 2008 - 18:37:14 GMT

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