python - when to reshape numpy array like (3,) - 


 a=np.arange(3)     a.shape    #(3,)  a.reshape(3,1)

somethings multiply, plus failed a. what's shape (3,) used for?

shape (n,) indicates 1 dimensional array. if reshape(3, 1) 2 dimensional array 1 column , 3 rows.

not sure question exactly, can elaborate?


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