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$logical <- NULL test
Updating Elements
To change an element's value, simply reassign it.
Example
12345test <- list(text = "Text", number = 42, logical = TRUE) # Update element test[1] <- "word" test
Swipe to start coding
You have a list info with course information.
Your tasks is to:
- Update the fourth element to
44(this chapter is the 44th). - Remove the third element (which is
1). - Add a new element named
Levelwith the value of'Beginner'. - Output modified list
info.
Løsning
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Lists are flexible: you can add, remove, or change their elements.
Adding Elements
To add a new element, assign a value to a new index or label.
Example
12345678# Creating a list test <- list(text = "Text", number = 42, logical = TRUE) # Add new value with a label test["integer"] <- 23L # Add new value with an index test[[5]] <- "new element" test
When adding by label, use quotes (e.g., "integer").
You can also merge two lists with the c() function, which combines them into one:
123456list1 <- list("first", 10) list2 <- list("second", 20) # Merge lists list12 <- c(list1, list2) list12
Removing Elements
To delete an element, assign NULL to it.
Example
12345test <- list(text = "Text", number = 42, logical = TRUE) # Remove element test$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.
Løsning
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