Lab 1A: R Language Basics (Easy)

1. Data Types

1. Create and print a numeric.

n <- 1.23

print(n)

## [1] 1.23

2. Data Structures

1. Create and print a vector.

v <- c(1, 2, 3);

print(v)

## [1] 1 2 3

3. Data Frames

1. Create a data frame.

df <- data.frame(
  Name = c("Cat", "Dog", "Cow", "Pig"), 
  HowMany = c(5, 10, 15, 20),
  IsPet = c(TRUE, TRUE, FALSE, FALSE))

2. Print a data frame.

print(df)

##   Name HowMany IsPet
## 1  Cat       5  TRUE
## 2  Dog      10  TRUE
## 3  Cow      15 FALSE
## 4  Pig      20 FALSE

3. Index the data frame by row 1 and column 2.

df[1, 2]

## [1] 5

4. Index the data frame by column name (shorthand).

df$HowMany

## [1]  5 10 15 20

5. Subset rows using the equality operator.

df[df$IsPet == TRUE, ]

##   Name HowMany IsPet
## 1  Cat       5  TRUE
## 2  Dog      10  TRUE