Version control review

What is R?

Diving in...

Your machine

fork

Your copy

Starter repo

git clone

git add *

Edit files

Staging area

git commit -m ".."

git push

View commit log

Checkout old version

Return to current version

git log --oneline

git checkout cbe1de6

git checkout master

More info

Built for working with data

Open-source

RStudio is a great IDE

Extraordinarily popular

Write a script (many lines of code)

Instructions are interpreted one at a time

Tell R to run your script

Read data

Manipulate data

Analyze data

Visualize data

Write a comment

Create a numeric variable

Create a string variable

# Start a comment with a "#" symbol

# Assign the value 2 to your variable x
x <- 2

# Assign the string "hello" to your variable x
x <- "hello"
x <- 'hello' # these do the same thing

Type the letter r

Type Rscript filename.r

Script

Console

Environment

Plots, packages, etc.

Sequence of elements of the same type

Can be stored in a variable

Made by combining elements

x <- c(2,5,1,3)

Indexed starting at 1

x[1] # the number 2

Capabilities built into R

Accept a number of arguments

Return a single value

x <- c(2,5,1,3) # 2,5,1,3

function name 'c'

arguments

returns a vector

# Generic
help(function_name)

# Example
help(c)

# Or (generic)
?function_name

# Example
?c

Additional set of R function

Used for analysis, manipulation, viz.

Need to be installed (once)

Need to be loaded (every time)

# Generic 
install.packages('package-name')

# Example
install.packages('stringr')

# Generic 
library(package-name)

# Example
library(stringr)

Assignment-2: Foundational skills (due Wed. 1/20)