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並前往https://www.quora.com/What-is-the-most-efficient-and-Pythonic-way-to-count-false-values-in-2D-NumPy-arrays

What is the most efficient (and Pythonic) way to count false ...

If you have a simple condition to check for values that are false (such as '<0′ because negative values are invalid) then: [code]import numpy as np np.sum(x ...

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