intro_r/doc/datatable_intro.org

Datatable package

• Introduction
• Some references to learn more about {data.table}

Org document with R code

  rm(list = ls())

Introduction

  library(data.table)

Reading data into R using {data.table}

  url = "https://raw.githubusercontent.com/Rdatatable/data.table/master/vignettes/flights14.csv"
  flights <- fread(url)

  names(flights)

  flights

  nrow(flights)

[1] 253316

Creating a data.table:

  dt <- data.table(col1 = c(1:6),
                   col2 = LETTERS[1:6],
                   col3 = (1))

  class(dt)

  class(dt$col2)

Some references to learn more about {data.table}

• https://cran.r-project.org/web/packages/data.table/vignettes/datatable-intro.html

• See vignettes in R:

  > vignette(package="data.table")
  

• https://atrebas.github.io/post/2019-03-03-datatable-dplyr/
• https://rdatatable.gitlab.io/data.table/
• https://s3.amazonaws.com/assets.datacamp.com/blog_assets/datatable_Cheat_Sheet_R.pdf
• https://stackoverflow.com/questions/21435339/data-table-vs-dplyr-can-one-do-something-well-the-other-cant-or-does-poorly

• dtplyr package:

  • https://github.com/tidyverse/dtplyr