Tina’s Workbook - Ch. 2: Workflow: Basics from R for Data Science, 2nd ed. (Wickham et al, 2023)

Coding Basics

• You can do basic math calculations in R:

1 / 200 * 30

## [1] 0.15

• You can create new objects in the assignment operator:

x <- 3 * 4
print(x)

## [1] 12

• You can combine multiple elements into a vector:

primes <- c(2, 3, 5, 7, 11, 13)
print(primes)

## [1]  2  3  5  7 11 13

• You can do basic arithmetic on elements in created vectors:

primes * 2

## [1]  4  6 10 14 22 26

• KEYBOARD SHORTCUT for “<-” in the console = “alt” + “-” (FYI: alt = “option” on MacBooks)… notice that it will add a space before and after “<-”, yay efficiency!

Comments

• Comments, or text that is not ran as code, are added by putting a “#” at the beginning of a line. This is good for leaving notes or explaining what code is for.

What’s in a name?

• If you want to look up all the names that start with a certain word/letter, type that word/letter and hit “command” + “alt” + “up arrow”

Calling Functions

• If you want to look up functions, you can type in the console and hit “tab”, for example to look at sequence functions type “se” in the console and hit tab. A drop-down menu will appear with every function beginning with “se”.

• Sequences example:

seq(from = 1, to = 10)

##  [1]  1  2  3  4  5  6  7  8  9 10

• Functions can also be simplified (look at the difference in code between this and above):

seq(1, 10)

##  [1]  1  2  3  4  5  6  7  8  9 10

END OF CHAPTER 2.