1. Read data off of hard drive

2. R stores it as an object

Working directory

setwd("D:/myData/") change a new working directory

list.files() show all the files in this directory

 Read data from this directory

myData <- read.csv("data1.csv")

or

myData <- read.csv(list.files()[3])

 Write data to this directory

write.csv(myData, "updated data.csv")

list.files()

head() shows the first few or 6 lines of the data

tail() shows the last few or 6 lines of the data

names() gives the column name of the data

Pulling out columns

Data$columnname

Data[, columnname]

Data[,3]