Dear all, Let me ask my question on this list because I am a new user of R. I have a problem with the Kmeans clustering method . In fact, having a symmetric matrix: g1 g2 .. ... gn g1 1 0,3 0,6 g2 0,3 1 0,4 . ...................................... . .................................... .. ........................................... gn 0,6 0,4 1 I should like to apply Kmeans on this matrix, knowing that there is no relation R(object, attribute) but R(object, object) only. Does the Kmeans algorithm works in this case? Could you give me a syntax for testingKmeans on this matrix. Thanks ---- -- ------------------------------------------------------------------ Sidahmed BENABDERRAHMANE PhD, LORIA France

Hello, Instead of k-means you could use pam in the cluster package. According to http://stat.ethz.ch/R-manual/R-patched/library/cluster/html/pam.html you can use the diss parameter to indicate pam that you are dealing with a distance (dissimilary) matrix instead of the original data frame. Best regards, Carlos J. Gil Bellosta http://www.datanalytics.com 2010/3/23 sidahmed BENABDERRAHMANE <sidahmed.benabderrahmane at="" loria.fr="">: > Dear all, > Let me ask my question on this list because I am a new user of R. > I have a problem with the Kmeans clustering method . In fact, having a > symmetric matrix: > > > ? ? ? ?g1 ? ? ?g2 ? ? ?.. ... ? ? ? gn > g1 ? ? 1 ? ? ? ?0,3 ? ? ? ? ? ? ? ? ? 0,6 > g2 ? ? ?0,3 ? ? ?1 ? ? ? ? ? ? ? ? ? ?0,4 > . ? ? ? ? ...................................... > . ? ? ? ? .................................... > .. ? ? ........................................... > gn ? ?0,6 ? ? ? 0,4 ? ? ? ? ? ? ? ? ? ? ? 1 > > I should like to apply Kmeans on this matrix, knowing that there is no > relation ?R(object, attribute) but R(object, object) only. > Does the Kmeans algorithm works in this case? > Could you give me a syntax for testingKmeans on this matrix. > > Thanks > > ---- > > -- > ------------------------------------------------------------------ > Sidahmed BENABDERRAHMANE > PhD, LORIA ?France > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: > http://news.gmane.org/gmane.science.biology.informatics.conductor >