step_function

sisl.physics.step_function(x, x0=0.0)

Step function, also known as $1-H(x)$

This function equals one minus the Heaviside step function

$$\begin{array}{r}S(x,x_0)=\{\begin{array}{rl}1& \text{for }x<x_0\\ 0.5& \text{for }x=x_0\\ 0& \text{for }x>x_0\end{array}\end{array}$$

Parameters:

• x (ArrayLike) – points at which the step distribution is calculated

• x0 (float | ArrayLike) – step position

Returns:

the step function distribution, same length as x

Return type:

numpy.ndarray