I used the same data, but not get the same figure

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huda nawaf 2012-9-5

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hi,

I try to built elbow code to determine the no. of clusters.I used the same data that used in the following link:

http://stackoverflow.com/questions/6645895/calculating-the-percentage-of-variance-measure-for-k-means#comment7854687_6645895

why I'm not get the same figure of elbow code in above link?

x = iris_dataset;
x=x';
 d=kmeans(x,9);
   for i=1:10
        a=find(d==i);
         for j=1:length(a)
             cluster(i,j)=a(j);
         end
   end
         for i=1:9
       cluster1{i}=cluster(i,:);
       var1(i)=var(cluster1{i});
         end
   s=sum(var1)/9;
   s1=var1/s;
  y(1:9)=1:9;
     plot(y,s1)

thanks in advance

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Answer 1

Doug Hull 2012-9-6

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KMEANS DOC

It looks to me like you are using the default settings for KMeans for the Start Parameter. This chooses a random starting subset. KMeans is NOT deterministic. You should expect different results each time, it is the nature of the algorithm.

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huda nawaf 2012-9-9

I do not think the reason in kmeans , but relate with somthing like scaling that thing I did not understand it.

thanks

Oleg Komarov 2012-9-9

The reason IS in the randomized selection of the start position in kmeans.

Compare d between two runs of kmeans.

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