Dear R-Helpers,

I performed kmeans clustering on the following data set(y):

 YEAR  PRODUCTS
    1          10
    2          42
    3          25
    4          42
    5          40
    6          45
    7          44
    8          47
    9          42


with this code:

cluster<-kmeans(y[,c("YEAR","PRODUCTS")],3).

Every time i run this code the components of cluster ("mean"  "vector")
changed value,i.e.

First run:

Cluster means

      YEAR  PRODUCTS
1 7.500000 44.50000
2 3.666667 41.33333
3 2.000000 17.50000

Clustering vector:
1 2 3 4 5 6 7 8 9
3 2 3 2 2 1 1 1 1

Second run:
Cluster means
      YEAR  PRODUCTS
1 2.000000 17.50000
2 3.666667 41.33333
3 7.500000 44.50000

Clustering vector:
1 2 3 4 5 6 7 8 9
1 2 1 2 2 3 3 3 3


How can i modify, if it is possible, the code to obtain the same value
("mean"  "vector") every time i'll run the code?

Thank you in advance.

Sergio Della Franca.

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