`scipy.stats._qmc:_van_der_corput_permutations`

source: /scipy/stats/_qmc.py :686

Signature

   def     _van_der_corput_permutations (    base  :  IntNumber    ,  * ,     rng  :  SeedType    =  None     )   →  np.ndarray

Summary

Permutations for scrambling a Van der Corput sequence.

Parameters

base : int: Base of the sequence.
rng : `numpy.random.Generator`, optional: Pseudorandom number generator state. When rng is None, a new numpy.random.Generator is created using entropy from the operating system. Types other than numpy.random.Generator are passed to numpy.random.default_rng to instantiate a Generator.
versionchanged 1.15.0
As part of the SPEC-007 transition from use of numpy.random.RandomState to numpy.random.Generator, this keyword was changed from seed to rng. During the transition, the behavior documented above is not accurate; see check_random_state for actual behavior. After the transition, this admonition can be removed.

Returns

permutations : array_like: Permutation indices.

Notes

In Algorithm 1 of Owen 2017, a permutation of np.arange(base) is created for each positive integer k such that 1 - base**-k < 1 using floating-point arithmetic. For double precision floats, the condition 1 - base**-k < 1 can also be written as base**-k > 2**-54, which makes it more apparent how many permutations we need to create.

Aliases

scipy.stats._qmc._van_der_corput_permutations