How to generate a Boolean array with random values?

Question

Basically, I want to generate a boolean array with given length but the content is randomly given.

Possible duplicate of [Create large random boolean matrix with numpy](https://stackoverflow.com/questions/43528637/create-large-random-boolean-matrix-with-numpy) — Kristianmitk, Sep 18 '19 at 17:09

score 3 · Accepted Answer · answered Dec 27 '18 at 03:45

3

You may found an answer here. Try

np.random.choice(a=[False, True], size=(N,))

answered Dec 27 '18 at 03:45

Froilan

68
6

score 1 · Answer 2 · answered Jun 12 '23 at 13:21

A faster implementation would be

from numpy.random import default_rng

size = 100_000
rng = default_rng()
rng.integers(0, 1, size, endpoint=True, dtype=bool)

On my machine

%timeit rng.integers(0, 1, size, endpoint=True, dtype=bool)
124 µs ± 595 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)

%timeit rng.choice(a=[False, True], size=size)
937 µs ± 3.93 µs per loop (mean ± std. dev. of 7 runs, 1,000 loops each)

Note that I used the new random generator, instructions here.

How to generate a Boolean array with random values?

2 Answers2