aggregate(c$a, list(b=b), sum)
--- marcg <[EMAIL PROTECTED]> wrote:
> Hello R
>
> For expierienced user, the following problem will be
> easy to solve:
>
> a<-c(0,1,0,1,0,2,3,4,3,2)
> b<-c(3,3,3,4,4,4,7,7,7,10)
> c<-data.frame(a,b)
>
> Data Frame c contains tow colums. I would like to
> sum
rowsum(c$a,c$b)
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of marcg
Sent: Tuesday, October 23, 2007 5:22 PM
To: [EMAIL PROTECTED]
Subject: [R] sum variable as long condition is true
Hello R
For expierienced user, the following problem will be easy to
marcg wrote:
> Hello R
>
> For expierienced user, the following problem will be easy to solve:
>
> a<-c(0,1,0,1,0,2,3,4,3,2)
> b<-c(3,3,3,4,4,4,7,7,7,10)
> c<-data.frame(a,b)
>
> Data Frame c contains tow colums. I would like to sum up all values in a as
> long as b stays the same:
>
> sum(a[w
Hello R
For expierienced user, the following problem will be easy to solve:
a<-c(0,1,0,1,0,2,3,4,3,2)
b<-c(3,3,3,4,4,4,7,7,7,10)
c<-data.frame(a,b)
Data Frame c contains tow colums. I would like to sum up all values in a as
long as b stays the same:
sum(a[which(b==1)])
does this, but i have t
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