Ceiling is defined in terms of Floor as ⌈Y←→-⌊-Y

Y must be numeric.

If an element of Y is real, the corresponding element of R is the least integer greater than or equal to the value of Y.

If an element of Y is complex, the corresponding element of R depends on the relationship between the real and imaginary parts of the numbers in Y.

Examples

      ⌈¯2.3  0.1  100  3.3
¯2 1 100 4
 
      ⌈1.2j2.5 1.2j¯2.5
1J3 1J¯2

For further explanation, see Floor.

⎕CT is an implied argument of Ceiling.