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I discover the error. The first time that i read the doc I don't have payed too much attention to the fact that Kmeans work only with unsigned char.<BR>Sorry for the spam ;)<BR>samuele<BR>                                               <br /><hr />Windows Live Today: <a href='http://www.microsoft.com/italy/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:it-it:SI_SB_3:092009' target='_new'>Resta aggiornato sulle attività dei tuoi amici su Flickr, Dada e MySpace</a></body>

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