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RandomState.exponential(scale=1.0, size=None)
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Draw samples from an exponential distribution.
Its probability density function is
for
x > 0
and 0 elsewhere. is the scale parameter, which is the inverse of the rate parameter . The rate parameter is an alternative, widely used parameterization of the exponential distribution [R147].The exponential distribution is a continuous analogue of the geometric distribution. It describes many common situations, such as the size of raindrops measured over many rainstorms [R145], or the time between page requests to Wikipedia [R146].
Parameters: scale : float
The scale parameter, .
size : int or tuple of ints, optional
Output shape. If the given shape is, e.g.,
(m, n, k)
, thenm * n * k
samples are drawn. Default is None, in which case a single value is returned.References
[R145] (1, 2) Peyton Z. Peebles Jr., ?Probability, Random Variables and Random Signal Principles?, 4th ed, 2001, p. 57. [R146] (1, 2) ?Poisson Process?, Wikipedia, http://en.wikipedia.org/wiki/Poisson_process [R147] (1, 2) ?Exponential Distribution, Wikipedia, http://en.wikipedia.org/wiki/Exponential_distribution
RandomState.exponential()
2017-01-10 18:19:34
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