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並前往https://stackoverflow.com/questions/13567345/how-to-calculate-the-sum-of-all-columns-of-a-2d-numpy-array-efficiently

How to calculate the sum of all columns of a 2D numpy array ...

@JohnVinyard - What if I wanted to sum only a subset of the columns (or rows)? Is there a way to specify a set of indices to sum along a certain axis? Thanks! – ...

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