NumPy np.cumsum累计求和的用法
>>> a =np.array([, ])>>> a
array([,
])
>>> np.cumsum(a)
array([ 1,3,6, 10, 15, 21])
>>> np.cumsum(a, dtype=float) # specifies type of output value(s)
array()
>>> np.cumsum(a,axis=0) # sum over rows for each of the 3 columns
array([,
])
>>> np.cumsum(a,axis=1) # sum over columns for each of the 2 rows
array([[ 1,3,6],
[ 4,9, 15]])
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