Ceiling

Ceiling(expr)

gives the first integer greater than or equal expr.

Ceiling(expr, a)

gives the first multiple of a greater than or equal to expr.

See:

>> Ceiling(1/3)
1

>> Ceiling(-1/3)
0

>> Ceiling(1.2)
2

>> Ceiling(3/2)
2

For complex expr, take the ceiling of real and imaginary parts.

>> Ceiling(1.3 + 0.7*I)
2+I

>> Ceiling(10.4, -1)
10

>> Ceiling(-10.4, -1)
-11