本文介绍了多种功能合计的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
是否有可能来自以下数据帧df1
Is is possible that from the following data frame df1
Branch Loan_Amount TAT
A 100 2.0
A 120 4.0
A 300 9.0
B 150 1.5
B 200 2.0
我可以使用聚合函数将以下输出作为数据框df2
I can use aggregate function to get the following output as a dataframe df2
Branch Number_of_loans Loan_Amount Total_TAT
A 3 520 15.0
B 2 350 3.5
我知道我可以使用nrow来计算number_of_loans并合并,但是我正在寻找更好的方法。
I know I can use nrow to calculate the number_of_loans and merge, but I am looking for a better method.
推荐答案
使用dplyr,您可以这样做:
With dplyr, you could do this:
library(dplyr)
group_by(d,Branch) %>%
summarize(Number_of_loans = n(),
Loan_Amount = sum(Loan_Amount),
TAT = sum(TAT))
输出
Source: local data frame [2 x 4]
Branch Number_of_loans Loan_Amount TAT
(fctr) (int) (int) (dbl)
1 A 3 520 15.0
2 B 2 350 3.5
数据
d <- read.table(text="Branch Loan_Amount TAT
A 100 2.0
A 120 4.0
A 300 9.0
B 150 1.5
B 200 2.0",head=TRUE)
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