[R] error in kmeans

[Ingmar Visser]

Hi Asha,

kmeans is a non-deterministic routine.

The help page says the following about the centers argument:

 centers: Either the number of clusters or a set of initial cluster
          centers. If the first, a random set of rows in 'x' are chosen
          as the initial centers.

Hence, different choices may lead to different results, ans as you can see
empty clusters. See ?try for a possible workaround if you want to keep using
kmeans.

Best, Ingmar

On 3/31/05 11:08 PM, "Asha Jayanthi" <ashajayanthi at hotmail.com> wrote:

> I am trying to generate kmean of 10 clusters for a 165 x 165 matrix.
> 
> i do not see any errors known to me. But I get this error on running the
> script
> 
> Error: empty cluster: try a better set of initial centers
> 
> the commands are
> 
> M <-matrix(scan("R_mutual",n = 165 * 165),165,165,byrow = T)
> 
> cl <- kmeans(M,centers=10,20)
> len = dim(M)[1]
> ....
> ....
> 
> I ran the same script last night and it was working prefectly. I have not
> made any changes at all !!!And this is very strange. This evening when I ran
> the same script i am getting this error. My matrix file is also untouched.
> 
> Can any one let me know how to go about this. I must generate 10-mean
> clusters
> Is there anyother way of doing it ? and how to avoid such error in future?
> 
> Asha
> 
> 
> http://www.cross-tab.com/surveys/run/test.asp?sid=2026&respid=1 Help us help
> you better!
> 
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-- 
Ingmar Visser
Department of Psychology, University of Amsterdam
Roetersstraat 15, 1018 WB Amsterdam
The Netherlands
http://users.fmg.uva.nl/ivisser/
tel: +31-20-5256735