Re: [R] rolling sum (like in Rmetrics package)

From: jim holtman <jholtman_at_gmail.com>
Date: Wed, 13 Feb 2008 11:31:28 -0500

Have you tried 'filter'?

> x <- 1:20
> filter(x,filter=rep(1,5))

Time Series:
Start = 1
End = 20
Frequency = 1
 [1] NA NA 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 NA NA
>

On 2/13/08, joshv <josh.verdone_at_yahoo.com> wrote:
>
>
> Hello, I'm new to R and would like to know how to create a vector of
> "rolling
> sums". (I have seen the Rmetrics package and the rollMean function and I
> would like to do the same thing except Sum instead of Mean.) I imagine
> someone has done this, I just can't find it anywhere.
>
> Example:
> x <- somevector #where x is 'n' entries long
>
> #what I would like to do is:
>
> x1 <- x[1:20]
> output1 <- sum(x1)
>
> x2 <- x[2:21]
> output2 <- sum(x2)
>
> x3 <- ...
>
> ouput <- c(output1, output2, ...)
>
>
> Thanks,
> JV
> --
> View this message in context:
> http://www.nabble.com/rolling-sum-%28like-in-Rmetrics-package%29-tp15459848p15459848.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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>

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

What is the problem you are trying to solve?

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Received on Wed 13 Feb 2008 - 16:40:27 GMT

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