⌈ — Ceiling / Maximum

Function. Keys: Alt-s. Ranks: 0 monadic, 0 0 dyadic

⌈Y rounds up to an exact integer. Pervasive; tolerant near integers. An infinity or NaN stays a float. Complex ceiling is -⌊-Y.

⌈1.2 ¯1.2         ⍝ [2 ¯1]ₓ
⌈3r2              ⍝ 2ₓ

X⌈Y takes the real maximum. Pervasive. Beside NaN it gives Y’s item. Beside NaN, ⌈/ and ⌈\ give NaN or the greatest other item, depending on the processor. Empty reduction identity: ¯∞.

3⌈1 5             ⍝ 3 5
3⌈1 $n 5          ⍝ 3 $n 5