Learning R Programming

Using dplyr pipelines to manipulate data frames

Another popular package is dplyr, which invents a grammar of data manipulation. Instead of using the subset function ([]), dplyr defines a set of basic erb functions as the building blocks of data operations and imports a pipeline operator to chain these functions to perform complex multistep tasks.

Run the following code to install dplyr from CRAN if you don't have it yet:

install.packages("dplyr") 

First, we will reload the product tables again to reset all data to their original forms:

library(readr) product_info <- read_csv("data/product-info.csv") product_stats <- read_csv("data/product-stats.csv") product_tests <- read_csv("data/product-tests.csv") toy_tests <- read_csv("data/product-toy-tests.csv") ...