Quick Guide to the RStudio User Interface

• Basic User Interface
• Use tab key for tab completion
• Changing the Default Working directory Tools -> General
• Changing the appearance of R Studio
  • Navigate to Tools -> Global Options -> Appearance
• When the R-Language was made available, there was lot of inbuilt functionality. R is a open source project.
• Lot of people have solving complex problems & they wanted to share their code so that others can use it => This led to creation of packages and to make this packages available to other Comprehensive R Archive Network (CRAN) was made available
• Lets install a package to understand how it works
  • Package will increase the functionality of R
  • Packages can be installed from console or from packages tab
    • Console => install.package("ggplot2") and library(ggplot2) to load the library
    • Packages tab
  • What if i dont know what package i need Refer Here
• Activity-1: Set your preferred theme and font-size on your R-Studio
• The activities of our work in class will be shared over here Refer Here

R-Programming Fundamentals

• Variable Types:
  • Variables exist in all programming languages which tell the computer to store and access a variable/data
  • Variable created in R will have class and type. We can look into class or type of anything in R using the class() and typeof() function
  • To assign a variable some value variable-name <- value
  • Class represents a broad categories such as character, number, integer and date. Whereas type elaborates more specifically on what the type of variable is double, character, POSIXct etc
• Numeric and Integers:
  • The numeric data class includes all numbers except integer. Anything of numeric class will be of type double
  • If you want to create an Integer, you must type a capital letter L after the whole number
• Character
  • character data is always mentioned in quotation marks, anything thing in quotations is called character string. Usually character data has both class and type as character
• Dates
  • Dates are special type of data R and ared distinct from the date types POSIXct and POSIXlt, which represent the calender dates and times in more formal ways
  • Let create a date using the following code

  independence <- as.Date("1947-08-15")
  republic <- as.POSIXct("1950-01-26")
  typeof(independence)
  typeof(republic)
  class(independence)
  class(republic)
  

  
• Logical: This represents the boolean value the valid values are TRUE, FALSE,T, F
  • Note: In R language, we can change the objects from one type to another using as.*() function. Refer below for usage
• Next Steps:
  • Data Structures:
    • Vectors
    • Lists
    • Matrices
    • Dataframes