df1 <- data.frame(Profit=c(7,2,8), CSR=c(1, 5, 9), row.names = c("A", "B", "C"))
df2 <- data.frame(Profit=c(13,4,2), CSR=c(4, 2, 8), row.names = c("A", "B", "C"))
df3 <- data.frame(Profit=c(6,2,5), CSR=c(3, 8, 20), row.names = c("A", "B", "C"))
l<-list(df1, df2, df3)
l
dfmean<- data.frame(Profit=c(9,3,5), CSR=c(2, 6, 13), row.names = c("A", "B", "C"))
dfmean
我想在存储在列表中的所有三个(或更多)数据帧上调用一个函数(这里:mean),返回组合在一个数据帧中的那些数据帧.在这种情况下,它应该看起来像dfmean.