R语言中管道运算符 %>%

1、测试1

library(dplyr)

fun1 <- function(x1, x2){return(x1 - x2)}
fun2 <- function(x1, x2, x3){return(x1 * x2 - x3)}

a = 8
b = 7
c = 3

y1 <- a %>% fun1(b,.)
y1
y2 <- a %>% fun1(.,b)
y2

y3 <- a %>% fun2(b,c,.)
y3

y4 <- a %>% fun2(.,b,c)
y4
##句点的位置代表了管道传进来数据的位置

2、测试2

rm(list = ls())

dat1 <- data.frame(v1 = 1:3, v2 = c("one", "two", "three"), v3 = letters[1:3], v4 = LETTERS[1:3])
dat1

dat2 <- dat1 %>% select(2,4)
dat2