CODEWITHSUNDEEP
pythonnumpy
user3557216
user3557216

Reputation: 269

Numpy flip boolean array by index?

Say I have

>>> arr = np.array([True, True, False], dtype=bool)

Is it possible to call something like

>>> arr.flip_boolean_array_by_index(2)
[True, True, True]

Upvotes: 0

Views: 1206

Answers (2)

Geoffrey Sametz
Geoffrey Sametz

Reputation: 638

I found that ^= 1 on a dytpe=numpy.bool_ array gave a UFuncTypeError (can't cast from dtype int64 to dtype bool). However, ^= True works, e.g. arr[idx] ^= True. This was in numpy 1.26.3.

Upvotes: 0

shx2
shx2

Reputation: 64318

You can use the bitwise-negation operator ~, or bitwise-xor (^) with 1.

arr[idx] = ~arr[idx]

or

arr[idx] ^= 1

idx can be an index, a slice, a "fancy" index, etc.

Upvotes: 2

Related Questions