pipe operator in R-Simplify Your Code with %>%
pipe operator in R comes from the “magrittr” package. What does the pipe operator do?
The purpose is to lower improvement time and to enhance clarity and maintainability of code.
Packages in “tidyverse” load %>% pipe operator automatically, so usually no need to load “magrittr” explicitly.
The major task of this operator will forward a value, or the result of an expression, into the next function call/expression.
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For instance, a function to filter data with the dplyr package can be written as
library(dplyr) filter(data,variable==value)
or
data %>% filter(variable==value)
Above functions whole the equal task, but while we need to carry out more than one function we can get a clearer written code through using the %>% operator.
library(tidyverse)
Objective:
Suppose we want to look at the common engine displacement of automobiles with four cylinders grouped via way of means of to transmission from biggest to smallest.
In a common scenario, we can solve the above problem based on three methods.
First method with nested functions, a second option with using objects, and a third option with a %>% operator.
Here we are going discuss about nested function and %>% operator.
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Method1:- Nested Function
arrange( summarize( group_by( filter(mpg,cyl==4),trans ),avg_displ=mean(displ) ), desc(avg_displ))
Ouput:-
trans avg_displ <chr> <dbl> 1 auto(s4) 2.5 2 auto(s5) 2.4 3 auto(av) 2.25 4 auto(l4) 2.20 5 manual(m5) 2.15 6 auto(l3) 2.1 7 manual(m6) 2.07 8 auto(s6) 2 9 auto(l5) 1.9
In this case, it’s analyzing from the middle, and a few instances now no longer smooth to address those types of codes.
If you are using multiple objects (not explained here) for large data set leads to memory issues, so we can handle the same thorough %>%, operator.
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Method 2: %>% pipe operator in R
mpg %>% filter(cyl==4) %>% group_by(trans) %>% summarize(avg_displ=mean(displ)) %>% arrange(desc(avg_displ))
Output:-
trans avg_displ <chr> <dbl> 1 auto(s4) 2.5 2 auto(s5) 2.4 3 auto(av) 2.25 4 auto(l4) 2.20 5 manual(m5) 2.15 6 auto(l3) 2.1 7 manual(m6) 2.07 8 auto(s6) 2 9 auto(l5) 1.9
Conclusion
The %>% operator provides a cleaner, more readable and effiecient functions.
