Y may be any numeric array. X may be any numeric array. R is Boolean. R is 1 if X is less than Y or X=Y. Otherwise R is 0.
⎕CT and ⎕DCT are implicit arguments of Less Or Equal.
Examples
2 4 6 8 10 ≤ 6
1 1 1 0 0
⎕CT←1E¯10
1 1.00000000001 1.00000001 ≤ 1
1 1 0