[R] Running sum

[Andy Bunn]

see ?cumsum
x <- 1:10
cumsum(x)
max(cumsum(x))

HTH, Andy


> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Sean Davis
> Sent: Friday, November 19, 2004 1:09 PM
> To: r-help
> Subject: [R] Running sum
> 
> 
> I have vector X of length N that I want to have a running sum for 
> (called Y).  I just need max(Y).  I do this with a "for" loop like so:
> 
>      Y <- vector(length=N)
>      Y[1] <- X[1]
>      for (i in 2:N) {
>        Y[i] <- Y[i-1]+X[i]
>      }
>      return(max(Y))
> 
> Is there a faster way to do this?
> 
> Thanks,
> Sean
> 
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