public double getSquaredDistance ( final DBIDRef id1 , final DBIDRef id2 ) { final int o1 = idmap . getOffset ( id1 ) , o2 = idmap . getOffset ( id2 ) ; return kernel [ o1 ] [ o1 ] + kernel [ o2 ] [ o2 ] - 2 * kernel [ o1 ] [ o2 ] ; }
Returns the squared kernel distance between the two specified objects .