Lära Modifying Vector Elements

Vectors can be modified by adding new elements or updating existing ones. This is useful when the data structure needs to grow or when values need to be corrected.

Adding Elements with Functions

Use the c() function or the append() function to add a new value to a vector. If the vector is named, you can then assign a label to the new element.

Example


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grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')

# Add new grade
grades <- c(grades, 60)
names(grades)[length(grades)] <- 'Philosophy'

grades

Adding Elements with Names

If the vector already has names, you can add a new element by assigning a value directly to a new name.

Example


              1234567
            
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')

# Add new grade 
grades['Philosophy'] <- 60

grades

Updating Elements

You can also modify existing values either by name or by index.

Example


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grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')

# Update second grade
grades[2] <- 60
# Update Math grade by name
grades["Math"] <- 100

Uppgift

Swipe to start coding

Add a new item named 'Desk' with a price of 135 to the end of the prices vector using the second method (assigning the name while adding the value).
Update the price of the 'Bookshelf' to 180. You can use either the index or the name to do this.
Display the modified vector prices.

Lösning

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 18

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Vectors can be modified by adding new elements or updating existing ones. This is useful when the data structure needs to grow or when values need to be corrected.

Adding Elements with Functions

Use the c() function or the append() function to add a new value to a vector. If the vector is named, you can then assign a label to the new element.

Example


              12345678
            
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')

# Add new grade
grades <- c(grades, 60)
names(grades)[length(grades)] <- 'Philosophy'

grades

Adding Elements with Names

If the vector already has names, you can add a new element by assigning a value directly to a new name.

Example


              1234567
            
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')

# Add new grade 
grades['Philosophy'] <- 60

grades

Updating Elements

You can also modify existing values either by name or by index.

Example


              1234567
            
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')

# Update second grade
grades[2] <- 60
# Update Math grade by name
grades["Math"] <- 100

Uppgift

Swipe to start coding

Add a new item named 'Desk' with a price of 135 to the end of the prices vector using the second method (assigning the name while adding the value).
Update the price of the 'Bookshelf' to 180. You can use either the index or the name to do this.
Display the modified vector prices.

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 18

single