R cheatsheet

Preliminaries

• install.packages("package_name",dependencies = TRUE) # install package
• library(package_name) # load package
• search() # list all packages attached
• ls() # list all objects in environment/package
• help(name) # help on package/function
• getwd() # get working directory
• list.files() # list files in working directory
• save.image() # save workspace to .Rdata
• savehistory() # save history to .Rhistory

Data types

• class(obj) # class of object
• dim() # dimension of matrix
• length() # length of array
• factor() # encode categorical variables using numeric storage (e.g. "red","orange","green")