nlcpy.random.Generator.exponential

Generator.exponential(self, scale, size=None)

Draws samples from an exponential distribution.

Its probability density function is

\[f(x; \frac{1}{\beta}) = \frac{1}{\beta} \exp(-\frac{x}{\beta}),\]

for x > 0 and 0 elsewhere. \(\beta\) is the scale parameter, which is the inverse of the rate parameter \(\lambda = 1/\beta\).

Parameters
scalefloat

The scale parameter, \(\beta = 1/\lambda\). Must be non-negative.

sizeint or tuple of ints, optional

Output shape. If the given shape is, e.g., (m, n, k), then m * n * k samples are drawn.

Returns
outndarray

Drawn samples from the parameterized exponential distribution.

制限事項

  • If scale is neither a scalar nor None : NotImplementedError occurs.