question: protected double [ ] [ ] meansWithTreshhold ( List < ? extends ModifiableDoubleDBIDList > clusters , double [ ] [ ] means , Relation < V > database , Double tresh ) { double [ ] [ ] newMeans = new double [ k ] [ ] ; for ( int i = 0 ; i < k ; i ++ ) { DoubleDBIDList list = clusters . get ( i ) ; double [ ] raw = null ; int count = 0 ; for ( DoubleDBIDListIter iter = list . iter ( ) ; iter . valid ( ) ; iter . advance ( ) ) { if ( iter . doubleValue ( ) >= tresh ) { continue ; } NumberVector vec = database . get ( iter ) ; if ( raw == null ) { raw = vec . toArray ( ) ; } for ( int j = 0 ; j < raw . length ; j ++ ) { raw [ j ] += vec . doubleValue ( j ) ; } count ++ ; } newMeans [ i ] = ( raw != null ) ? VMath . timesEquals ( raw , 1.0 / count ) : means [ i ] ; } return newMeans ; }
target:  Returns the mean vectors of the given clusters in the given database.