RandomState.beta()

RandomState.beta(a, b, size=None)

Draw samples from a Beta distribution.

The Beta distribution is a special case of the Dirichlet distribution, and is related to the Gamma distribution. It has the probability distribution function

$f(x; a,b) = \frac{1}{B(\alpha, \beta)} x^{\alpha - 1}(1 - x)^{\beta - 1},$

where the normalisation, B, is the beta function,

$B(\alpha, \beta) = \int_0^1 t^{\alpha - 1}(1 - t)^{\beta - 1} dt.$

It is often seen in Bayesian inference and order statistics.

Parameters:

Parameters:	a : float Alpha, non-negative. b : float Beta, non-negative. size : int or tuple of ints, optional Output shape. If the given shape is, e.g., `(m, n, k)`, then `m * n * k` samples are drawn. Default is None, in which case a single value is returned.
Returns:	out : ndarray Array of the given shape, containing values drawn from a Beta distribution.

a : float

Alpha, non-negative.

b : float

Beta, non-negative.

size : int or tuple of ints, optional

Output shape. If the given shape is, e.g., (m, n, k), then m * n * k samples are drawn. Default is None, in which case a single value is returned.

Returns:

out : ndarray

Array of the given shape, containing values drawn from a Beta distribution.

Links:

https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.random.RandomState.beta.html

doc_NumPy

2017-01-10 18:19:31

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