UnitStep

UnitStep[x] represents the unit step function, equal to 0 for x < 0 and 1 for x ≥ 0.

UnitStep[x1, x2, ...] is 1 only if none of the xi are negative.

Examples

Evaluate the unit step:

UnitStep[-1]
(* 0 *)

UnitStep[0]
(* 1 *)

UnitStep[5]
(* 1 *)

Plot the unit step function:

Plot[UnitStep[x], {x, -2, 2}]

Please visit the official Wolfram Language Reference for more details.