> library(readxl)
Warning message:
程辑包‘readxl’是用R版本3.3.3 来建造的
> data <- read_excel("C:/Users/gongyu/Desktop/new/data.xls")
> View(data)
> data %>%
+ ggplot(aes(x = time, y = num)) +
+ geom_line(aes(color = school))
Error: could not find function "%>%"