R Basics

• Comments start with #

  • No specific syntax for multi-line comments

• Index starts from 1

• Most index in R are inclusive

  • c(1,2,3)[1:2] returns 1 2

• The naming convention of files and variables is snake_case

• Print variables using print

• Assign a value to a variable using

  • x <- 1 (preferred traditionally)
  • 1 -> x
  • x = 1

• Variables in R are dynamic typing like Python

• The default arithmetics in R are element-wise, unlike MATLAB

• The interactive shell of R uses an indicator [x] to show the index of the printed vector

  • example:

    > x <- 11:30
    > x
     [1] 11 12 13 14 15 16 17 18 19 20 21 22
    [13] 23 24 25 26 27 28 29 30
    ```
- Use function `View()` to view data in a specific RStudio viewer

by zcysxy