In matthewhirschey/bespokelearnr: Bespoke data science learning

R
Packages

Any questions?

R Packages

The R language contains thousands of functions, data sets, and help pages.
- but only a few hundred are included when you download R

This is called 'Base R'

The other functions, data sets, and help pages are grouped into collections known as packages that you can choose to download or not download.

“Verbs” (i.e. functions) act on data

do_this(to_that)

do_this(to_that, using_these)

We talked about functions before (e.g. round(pi, 3))

Functions are the power of using R

Packages contain functions, documentation, data

CRAN

• Most R packages are stored on CRAN, alongside R.
• Think of them as optional extensions of the R language.

url <- "https://gist.githubusercontent.com/daroczig/3cf06d6db4be2bbe3368/raw/b66b0531fb1b86d3e04a003b2e105ad4f147900e/number-of-submitted-packages-to-CRAN.png"
knitr::include_graphics(url)

Image by daroczig

Using Packages (Part I)

1. install.packages("tidyverse")

Do this 1 time per computer.

This command will install the package into your instance of R, whether it is local, on a server, or in the cloud. This is required to use the functions in a package.

Tidyverse

Tidyverse Pop Quiz!

The tidyverse contains the following packages (ggplot2, dplyr, tidyr, readr, purrr, tibble, hms, stringr, lubridate, forcats, DBI, haven, httr, jsonlite, readxl, rvest, xml2, modelr, tidyverse).

How would you install them?

Tidyverse Pop Quiz! {.build}

install.packages("ggplot2") install.packages("dplyr") install.packages("tidyr") install.packages("readr") install.packages("purrr") install.packages("tibble") install.packages("hms") install.packages("stringr") install.packages("lubridate") install.packages("forcats") install.packages("DBI") install.packages("haven") install.packages("httr") install.packages("jsonlite") install.packages("readxl") install.packages("rvest") install.packages("xml2") install.packages("modelr") install.packages("broom")

Better:
install.packages("tidyverse")
An R package that serves as a short cut for installing and loading the components of the tidyverse.

Using Packages (Part II)

1.install.packages("tidyverse")

Do this 1 time per computer.

2.library(tidyverse)

Do this 1 time per session

Using Packages (Part II) {.build}

Downloading a package isn't the same as using it.

If you'd like to use an R package, you need to tell R.
You do that by running the command library, again followed by parentheses and the package name.

library(package_name)

This command loads all of the functions, data sets, and help pages that come with the package into your R session, where you can use them.

If you close R, you'll need to reload the package with library() if you want to use it again.

Using Packages (Part III)

The setup chunk is always run once before anything else

url <- "https://github.com/matthewhirschey/tidybiology-plusds/raw/master/media/setup.png"
knitr::include_graphics(url)

matthewhirschey/bespokelearnr documentation built on Oct. 11, 2020, 12:57 a.m.