Thanks Lance, but i have still many questions. Do i need to put all data in a matrix i think, but how? I used SVD command line of Mahout with seqdirectory and seq2sparse, but without success :) Well i think i need something like this finally: http://lucene.472066.n3.nabble.com/Using-SVD-with-Canopy-KMeans-td1407217.html#a1407801 but for recommendations. Can you help me with some suggestions or tutorials? I see that there is much interest in SVD and DistributedLanczos but really few suggestions and tutorials. Thank you again for your time and help, Stefano
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