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NumPy - the sum of the elements of the secondary diagnosis of a two-dimensional matrix

How can I get the sum of the elements on the secondary diagonal of a matrix? numpy.trace

seems to only return the main diagonals and numpy.diagonal

doesn't help with the secondary diagonal either.

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1 answer


You can always just flip the array a

(top to bottom) and use np.trace

:



a[::-1].trace()
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