Working directory in R

This is part of My notes on R programming on my site https://dataz4s.com

Read in data, attaching and checking

# Read in data via read_excel
library(readxl)
LungCapData <- read_excel("C:/Users/Usuario/Documents/dataZ4s/R/MarinLectures/LungCapData.xlsx", 
                          col_types = c("numeric", "numeric", "numeric", 
                                        "text", "text", "text"))

# R reads in Smoke, Gender and Caesarean as "text". Needs change to "factor"
# Change Smoke, Gender and Caesarean to factors with as.factor() command
LungCapData$Smoke <- as.factor(LungCapData$Smoke)
LungCapData$Gender <- as.factor(LungCapData$Gender)
LungCapData$Caesarean <- as.factor(LungCapData$Caesarean)

# attach(LungCapData)
attach(LungCapData)
names(LungCapData)

## [1] "LungCap"   "Age"       "Height"    "Smoke"     "Gender"    "Caesarean"

getwd

# See what working directory we are in
getwd()

## [1] "C:/Users/Usuario/Documents/dataZ4s/R/WD"

setwd

# Setting wd by inserting path
setwd("C:/Users/Usuario/Documents/dataZ4s/R/WD")

# Making use of the ~ command 
setwd("~/dataZ4s/R/WD")

Saving path into an object

# Saving path into an object can make it easier as it can be saved in script 
# Enables to set wd via code in e.g. a script
projectWD <- "/~/dataZ4s/R/WD"

# Enables to set wd via setwd(projectWD)

Example

# Say we wish save some work
# We will start creating some work

MeanAge <- mean(Age)
x <- c(1,2,3,4,5)
y <- 14
z <- summary(LungCapData)
z

##     LungCap            Age            Height      Smoke        Gender   
##  Min.   : 0.507   Min.   : 3.00   Min.   :45.30   no :648   female:358  
##  1st Qu.: 6.150   1st Qu.: 9.00   1st Qu.:59.90   yes: 77   male  :367  
##  Median : 8.000   Median :13.00   Median :65.40                         
##  Mean   : 7.863   Mean   :12.33   Mean   :64.84                         
##  3rd Qu.: 9.800   3rd Qu.:15.00   3rd Qu.:70.30                         
##  Max.   :14.675   Max.   :19.00   Max.   :81.80                         
##  Caesarean
##  no :561  
##  yes:164  
##           
##           
##           
## 

Save and load

# Save project
save.image("FirstProject.Rdata")

# To load the project we can use the load() command

This is a walk through of Mick Marin’s Statslectures video ‘Setting Up WD in R’