P1 - Data Structures

Question 1

Array function

Answer 1

• A 3D structure that takes one data type

- array(df, dim = c(1,1,1))

Question 2

Matrix function

Answer 2

• 2D data structure that only takes one data type

- matrix(df, nrow = x, ncol = y, byrow = T/F, dimnames = list(c()))

Question 3

Factor function

Answer 3

• Converts characters to factor (categorical)

Question 4

Data frame function

Answer 4

• 2D structure that uses many data types

- data.frame( variable name = c(“help”, “hello”), number variable = c(1,2)…)

Question 5

Use the summarise function and remove NA values.

Answer 5

• summarise(df, NEW column name = mean(column, na.rm = TRUE))