cumsum()，通常用于计算一个数组各行的累加值，函数用法是B = cumsum(A,dim)，或B = cumsum(A)。

def cumsum(self, axis=0, *args, **kwargs):        """        Cumulative sum of non-NA/null values.        When performing the cumulative summation, any non-NA/null values will        be skipped. The resulting SparseSeries will preserve the locations of        NaN values, but the fill value will be `np.nan` regardless.        Parameters        ----------        axis : {0}        Returns        -------        cumsum : SparseSeries        """

 

举例说明：

data数据，对盈利求和是37535

# A1的cumsum()是前1行的数据之和；A2的cumsum()是前2行的数据之和（9173+5729=14902）；…… data.cumsum()------A1      9173A2     14902A3     19713A4     23307A5     26502A6     29528A7     31906A8     33876A9     35753A10    37535

 

#Python程序段里的这条语句的意思是？p = 1.0*data.cumsum()/data.sum() # 1.0让数据浮点格式化 #

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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