question: protected double [ ] [ ] computeDistanceMatrix ( final List < I > col ) { final int size = col . size ( ) ; double [ ] [ ] imat = new double [ size ] [ size ] ; boolean squared = dist instanceof SquaredEuclideanDistanceFunction ; FiniteProgress dprog = LOG . isVerbose ( ) ? new FiniteProgress ( "Computing distance matrix" , ( size * ( size - 1 ) ) > > > 1 , LOG ) : null ; for ( int x = 0 ; x < size ; x ++ ) { final I ox = col . get ( x ) ; for ( int y = x + 1 ; y < size ; y ++ ) { final I oy = col . get ( y ) ; double distance = dist . distance ( ox , oy ) ; distance *= ( squared ? - .5 : ( - .5 * distance ) ) ; imat [ x ] [ y ] = distance ; imat [ y ] [ x ] = distance ; } if ( dprog != null ) { dprog . setProcessed ( dprog . getProcessed ( ) + size - x - 1 , LOG ) ; } } LOG . ensureCompleted ( dprog ) ; return imat ; }
target:  Compute the distance matrix of a vector column.