Python 将多列除以熊猫中的另一列
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Divide multiple columns by another column in pandas
提问by itzy
I need to divide all but the first columns in a DataFrame by the first column.
我需要将 DataFrame 中除第一列以外的所有列除以第一列。
Here's what I'm doing, but I wonder if this isn't the "right" pandas way:
这是我正在做的事情,但我想知道这是否不是“正确”的熊猫方式:
df = pd.DataFrame(np.random.rand(10,3), columns=list('ABC'))
df[['B', 'C']] = (df.T.iloc[1:] / df.T.iloc[0]).T
Is there a way to do something like df[['B','C']] / df['A']
? (That just gives a 10x12 dataframe of nan
.)
有没有办法做类似的事情df[['B','C']] / df['A']
?(这只是给出了一个 10x12 的数据帧nan
。)
Also, after reading some similar questions on SO, I tried df['A'].div(df[['B', 'C']])
but that gives a broadcast error.
另外,在阅读了一些关于 SO 的类似问题后,我尝试过,df['A'].div(df[['B', 'C']])
但这给出了广播错误。
采纳答案by Dthal
I believe df[['B','C']].div(df.A, axis=0)
and df.iloc[:,1:].div(df.A, axis=0)
work.
我相信df[['B','C']].div(df.A, axis=0)
并df.iloc[:,1:].div(df.A, axis=0)
工作。