[R] partially sum variable of a dataframe

[jim holtman]

sum(c$b[(c$a > 3) & (c$a < 5.25)])

On 11/7/07, mdgi at gmx.ch <mdgi at gmx.ch> wrote:
> Hello,
>
> A stupid question:
>
> I have an array with two columns, the first "a" acting as my index in 0.25 steps, the second one "b" the column of interest. How can i sum up "b" only for a specified window in "a" (as the window command for time series)
>
> a=seq(0,10,0.25)
> b=runif(41)
> c=data.frame(a,b)
>
> Sum up c if 3<a<5.25
>
> How to do that? thanks
>
> marc
> --
> Psssst! Schon vom neuen GMX MultiMessenger gehört?
> Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
>
> ______________________________________________
> 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.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?