heaviside

sisl.physics.heaviside(x, x0=0.0)

Heaviside step function

\begin{align} H(x,x_0) = \left\{\begin{aligned}0&\quad \text{for }x < x_0 \\ 0.5&\quad \text{for }x = x_0 \\ 1&\quad \text{for }x>x_0 \end{aligned}\right. \end{align}