R help - Jun 2011 - assign a cluster based on a variable

Hi,

I have two matrices of the following form:

cluster (n=18):
12062  1
12063  2
12064  2
12065  3
12066  5

KreisSA (n=2304)
12062
12062
12067
12065
12063
12067

I try to assign the cluster[,2] to KreisSAa by the follwoing loop:

n <- nrow(cluster)
KreisSAa <- numeric()

for(i in 1:n){
  KreisSAa[KreisSA == cluster[i,1]] <- cluster[i,2]
}

The result is a vector of the length n=4608 where after the entry 2304 
are just NA's
Has someone an idea what I do wrong?

Thanks for your help.
Dominik

On 07.06.2011 16:24, Dominik P.H. Kalisch wrote:
> Hi,
>
> I have two matrices of the following form:
>
> cluster (n=18):
> 12062 1
> 12063 2
> 12064 2
> 12065 3
> 12066 5
>
> KreisSA (n=2304)
> 12062
> 12062
> 12067
> 12065
> 12063
> 12067
>
> I try to assign the cluster[,2] to KreisSAa by the follwoing loop:
>
> n <- nrow(cluster)
> KreisSAa <- numeric()
>
> for(i in 1:n){
> KreisSAa[KreisSA == cluster[i,1]] <- cluster[i,2]
> }
>
> The result is a vector of the length n=4608 where after the entry 2304
> are just NA's
> Has someone an idea what I do wrong?
Since we do not know the structure of your objects, we cannot say 
easily. You may want to provide

str(cluster)
and
str(KreisSA)

Anyway: I'd just use merge()

Uwe Ligges





> Thanks for your help.
> Dominik
>
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