CODEWITHSUNDEEP
pythonnumpy
Kambiz
Kambiz

Reputation: 715

Pythonic array indexing with boolean masking array

I get a PEP8 complaint about numpy.where(mask == False) where mask is a boolean array. The PEP8 recommendation comparison should be either 'if condition is false' or 'if not condition'. What is the pythonic syntax for the suggested comparison inside numpy.where()?

Upvotes: 0

Views: 951

Answers (1)

user2357112
user2357112

Reputation: 280207

Negating a boolean mask array in NumPy is ~mask.

Also, consider whether you actually need where at all. Seemingly the most common use is some_array[np.where(some_mask)], but that's just an unnecessarily wordy and inefficient way to write some_array[some_mask].

Upvotes: 1

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