Lära Operations with Vectors

Vectors in R support arithmetic operations. Operations can be performed element by element between two vectors of the same length, or between a vector and a single number (applied to each element).

Element-wise Operations

Vectors of equal length can be combined with arithmetic operators, computing results element by element.

Example


              123456
            
a <- c(10, 20, 30)
b <- c(40, 25, 5)

# Addition (element by element)
c <- a + b
c

Scalar Operations

A single number can be combined with a vector, and the operation is applied to every element.

Example


              1234567
            
a <- c(10, 20, 30)
b <- c(40, 25, 5)
c <- a + b

# Multiply each element by 2
d <- c * 2
d

Aggregate Functions

R also has many functions, such as sum() and mean(), that work directly on vectors.

Example


              123456789
            
a <- c(10, 20, 30)
b <- c(40, 25, 5)
c <- a + b
d <- c * 2

# Calculate the sum
sum(d)
# Calculate the average
mean(d)

Uppgift

Swipe to start coding

You work at a store. During the day, you were able to sell the following items:

Item	Price	Items sold
Sofa	$340	5
Armchair	$150	7
Dining table	$115	3
Dining chair	$45	15
Bookshelf	$160	8

Your task is to:

Construct a vector called sold with the respective values from the Items sold column.
Calculate the revenue by multiplying the prices and sold vectors.
Display the total sum of the revenue vector.

Lösning

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 20

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Vectors in R support arithmetic operations. Operations can be performed element by element between two vectors of the same length, or between a vector and a single number (applied to each element).

Element-wise Operations

Vectors of equal length can be combined with arithmetic operators, computing results element by element.

Example


              123456
            
a <- c(10, 20, 30)
b <- c(40, 25, 5)

# Addition (element by element)
c <- a + b
c

Scalar Operations

A single number can be combined with a vector, and the operation is applied to every element.

Example


              1234567
            
a <- c(10, 20, 30)
b <- c(40, 25, 5)
c <- a + b

# Multiply each element by 2
d <- c * 2
d

Aggregate Functions

R also has many functions, such as sum() and mean(), that work directly on vectors.

Example


              123456789
            
a <- c(10, 20, 30)
b <- c(40, 25, 5)
c <- a + b
d <- c * 2

# Calculate the sum
sum(d)
# Calculate the average
mean(d)

Uppgift

Swipe to start coding

You work at a store. During the day, you were able to sell the following items:

Item	Price	Items sold
Sofa	$340	5
Armchair	$150	7
Dining table	$115	3
Dining chair	$45	15
Bookshelf	$160	8

Your task is to:

Construct a vector called sold with the respective values from the Items sold column.
Calculate the revenue by multiplying the prices and sold vectors.
Display the total sum of the revenue vector.

Lösning

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 20

single