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01-intro-R.md

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01 Introduction to R

0. Installation and Setting Up

Setting preference (Optional)

You can set appearance and pane layout in Menu Tools > Global Options...

In R Studio compose of 4 Pane:

  1. Source: for script file
  2. Concole: for watch result from running
  3. Environment: show variable that you have assign
  4. Files, Plots, Packages, Help: show other information

1. Setup Directory

In this part you need to get and set working directory of program RStudio Desktop. It has 3 Step

  • Step 1: Get working directory by using getwd()
  • Step 2: Create new folder then set working directory to this folder by using setwd("path")
  • Step 3: Try to add some file then check it that you are setting directory right.
#Get Working Directory
getwd()

#Set Working Directory
setwd("path")

#List the Files in a Directory/Folder
dir()

1.1. How can we get folder path (Step 2)

for macOS:

open terminal app and then go to your folder with cd then using command pwd to print working directory

#Terminal App (Sample)
jatawatsafe@Safe-MBP ~ % pwd
/Users/jatawatsafe

jatawatsafe@Safe-MBP ~ % ls
Desktop			Library			Postman

jatawatsafe@Safe-MBP ~ % cd Desktop/R-214 

jatawatsafe@Safe-MBP R-214 % pwd
/Users/jatawatsafe/Desktop/R-214

# Back to R and put this path in setwd()
setwd("/Users/jatawatsafe/Desktop/R-214")

#Linux command in Terminal
ls                               #List file
cd  folderName/folderName        #Change directory
pwd                              #Print Working Directory

for windows:

  1. Open File Explorer and go to your folder
  2. Right click at navigate and copy your address (or use another ways)
  3. Put in command setwd() and change \ to / ***If not change it will Error
# When you get path from address: 
# C:\Users\safe\Desktop\R-INT214

# When using in R
setwd("C:/Users/safe/Desktop/R-INT214")

1.2. Create file and list file (Step 3)

Create file test.txt in your folder then go to console in R Studio and using dir() to list all files in working directory

for macos:

Open Terminal app (make sure that you are right working directory by using pwd to check) try to create new file by using command touch test.txt to create blank file

for windows:

Right click on your folder select New > Text Document then save it to folder.

Easy way to set Directory:

Setting default working directory by use menu Session > Set working directory > Choose...

2. Basic Tools

Try to run this in console...

#comment
1+1
# formula
2*100 - 5
# Print function
print("Hello")

3. Run Script

3.1. Create Script file and save 1-MyScript.R

3.2. copy code in Topic 2 and paste in script file.

3.3. Run Script

  • Command+Enter Run the current line or selection
  • Command+option+R Run all
  • Ctrl+L Clear console

4. Basic Operation

We can create variable by using <- it mean assign value (right) to variable (left)

# create variable
x <- 1
y <- 2
x+y
print(x + y)
z <- x+y
z

Notes

# Directory
getwd()
setwd()

# Help Function
?
help()