Modifying List Elements
Lists are flexible: you can add, remove, or change their elements.
Adding Elements
To add a new element, assign a value to a new index or label.
Example
12345678# Creating a list test <- list(text = "Text", number = 42, logical = TRUE) # Add new value with a label test["integer"] <- 23L # Add new value with an index test[[5]] <- "new element" test
When adding by label, use quotes (e.g., "integer").
You can also merge two lists with the c() function, which combines them into one:
123456list1 <- list("first", 10) list2 <- list("second", 20) # Merge lists list12 <- c(list1, list2) list12
Removing Elements
To delete an element, assign NULL to it.
Example
12345test <- list(text = "Text", number = 42, logical = TRUE) # Remove element test$logical <- NULL test
Updating Elements
To change an element's value, simply reassign it.
Example
12345test <- list(text = "Text", number = 42, logical = TRUE) # Update element test[1] <- "word" test
Swipe to start coding
You have a list info with course information.
Your tasks is to:
- Update the fourth element to
44(this chapter is the 44th). - Remove the third element (which is
1). - Add a new element named
Levelwith the value of'Beginner'. - Output modified list
info.
Lösning
Tack för dina kommentarer!
single
Fråga AI
Fråga AI
Fråga vad du vill eller prova någon av de föreslagna frågorna för att starta vårt samtal
Fantastiskt!
Completion betyg förbättrat till 2.27Modifying List Elements
Svep för att visa menyn
Lists are flexible: you can add, remove, or change their elements.
Adding Elements
To add a new element, assign a value to a new index or label.
Example
12345678# Creating a list test <- list(text = "Text", number = 42, logical = TRUE) # Add new value with a label test["integer"] <- 23L # Add new value with an index test[[5]] <- "new element" test
When adding by label, use quotes (e.g., "integer").
You can also merge two lists with the c() function, which combines them into one:
123456list1 <- list("first", 10) list2 <- list("second", 20) # Merge lists list12 <- c(list1, list2) list12
Removing Elements
To delete an element, assign NULL to it.
Example
12345test <- list(text = "Text", number = 42, logical = TRUE) # Remove element test$logical <- NULL test
Updating Elements
To change an element's value, simply reassign it.
Example
12345test <- list(text = "Text", number = 42, logical = TRUE) # Update element test[1] <- "word" test
Swipe to start coding
You have a list info with course information.
Your tasks is to:
- Update the fourth element to
44(this chapter is the 44th). - Remove the third element (which is
1). - Add a new element named
Levelwith the value of'Beginner'. - Output modified list
info.
Lösning
Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedanTack för dina kommentarer!
single
