Labeling Vector Elements
Vectors in R can be labeled so that each value has an associated name. This makes the data easier to interpret, especially when values represent categories such as subjects, products, or months.
Assigning Labels
To label a vector, create a separate vector of names and assign it to the original vector using the names() function. Each label will then correspond to the matching element by position.
Example
Suppose you have grades in several subjects:
This is how you would represent this table in R:
123456# Create a vector of grades grades <- c(80, 75, 95, 100) # Assign names to the grades names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Display the labeled vector grades
The output displays each grade alongside its corresponding subject, making the results easier to understand.
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You manage a local furniture store. You have a list of items and their respective prices, as shown below:
| Item | Price |
|---|---|
| Sofa | $340 |
| Armchair | $150 |
| Dining table | $115 |
| Dining chair | $45 |
| Bookshelf | $160 |
Your task is to store the prices in a vector named prices and label each price with the corresponding item:
- Construct a vector of prices and store it in the variable
prices. - Use the variable
itemsto assign names to the elements in thepricesvector. - Display the
pricesvector.
Solution
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Vectors in R can be labeled so that each value has an associated name. This makes the data easier to interpret, especially when values represent categories such as subjects, products, or months.
Assigning Labels
To label a vector, create a separate vector of names and assign it to the original vector using the names() function. Each label will then correspond to the matching element by position.
Example
Suppose you have grades in several subjects:
This is how you would represent this table in R:
123456# Create a vector of grades grades <- c(80, 75, 95, 100) # Assign names to the grades names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Display the labeled vector grades
The output displays each grade alongside its corresponding subject, making the results easier to understand.
Swipe to start coding
You manage a local furniture store. You have a list of items and their respective prices, as shown below:
| Item | Price |
|---|---|
| Sofa | $340 |
| Armchair | $150 |
| Dining table | $115 |
| Dining chair | $45 |
| Bookshelf | $160 |
Your task is to store the prices in a vector named prices and label each price with the corresponding item:
- Construct a vector of prices and store it in the variable
prices. - Use the variable
itemsto assign names to the elements in thepricesvector. - Display the
pricesvector.
Solution
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