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Numpy pit: after the addition of dimension (n, 1) and dimension (n,) array, the dimension becomes (n, n)

2022-07-05 08:37:00 【Wow, Kaka, negative, positive】

Numpy dimension (n, 1) and dimension (n, ) Dimension change after array addition operation of

Define a ( 100 , 1 ) (100, 1) (100,1) An array of dimensions 

a = np.ones((100, 1))
a.shape

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Define a ( 100 , ) (100, ) (100,) An array of dimensions 

b = np.ones((100,))
b.shape

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Add two arrays 

(a + b).shape

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summary ： Be careful Numpy The middle dimension (n, 1) and dimension (n, ) The dimension after the array addition operation of becomes (n, n)

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