Y may be any numeric array. X may be any numeric array. R is Boolean. R is 1 if X is less than Y and X=Y is 0. Otherwise R is 0.
⎕CT and ⎕DCT are implicit arguments of Less.
(2 4) (6 8 10) < 6 1 1 0 0 0 ⎕CT←1E¯10 1 0.99999999999 0.9999999999<1 0 0 1