我如何“magrittr”管道到 R 包“Hmisc”的 summarise() 函数？

Question

I am trying to reduce the nested parenthesis using pipes of package magrittr . So I am trying to implement summarize() function of Hmisc package.

 data(iris)
summarize(iris$Sepal.Length,iris$Species,mean)

How to use pipes (%>%) of magrittr package in R?

Answer 1

Hello you can use with like this :

library("Hmisc")
library("magrittr")
data(iris)
iris %>% with(summarize(X = Sepal.Length, by = Species, FUN = mean))

EDIT : Even better you can use %$% operator and skip the with step :

iris %$% summarize(X = Sepal.Length, by = Species, FUN = mean)

##     Species Sepal.Length
##1     setosa        5.006
##2 versicolor        5.936
##3  virginica        6.588

Answer 2

You can use the dplyr package.

> library("dplyr")
> iris %>% group_by(Species) %>% summarize(length = mean(Sepal.Length))