Exponential particle distribution. Returns values given by the normalised exponential PDF

$f : x \mapsto \dfrac{\lambda e^{-\lambda x}}{1 - e^{-\lambda}}$

where $$\lambda = \mathtt{rate}$$.

Parameters
• rate (float, optional, default: 5.0) – Decay rate $$\lambda$$. The default value ensures a 99.3% decay on the [0, 1] interval. Mutually exclusive with scale.

• scale (float, optional) – Scale $$\beta = 1 / \lambda$$. Mutually exclusive with rate.

Fields

rate (float) – Decay rate $$\lambda$$.