np.mean计算一个列表的平均值,但是我得到了一个错误,声明:AttributeError: 'str' object has no attribute 'mean'volumetric_power= [x/y for x,y in zip(mcnp_calculated_power,mcnp_vol)]normalized_power = [x/np.mean(volumetric_powe
万条记录的同一数据库上,它需要一分钟以上的时间 n.CustomerInvoiceNumberId as InvoiceNo,C.CustomerBillId,c.customerid, S.VolumetricS.Discount, C.Debit,c.EffectiveDate,c.TransactionDateTime,s.Consumption,r.CustomerCreditNoteId--,s.Volumetricvariance CustomerPayments C (SELECT