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R Introduction: Part I

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Labeling Vectors

Now that you're familiar with creating vectors, let's apply them to store and label valuable information, such as grades on a scale from 1 to 100. However, the grades alone may not be self-explanatory to someone else.

Suppose the grades are as follows:

While you know how to create a vector with grades, the next step is labeling those values with their corresponding subjects. This can be done by assigning a vector of names to names(vector), where vector is your original vector that you wish to label.

Here's how you can do that:

grades <- c(80, 75, 95, 100) # Vector of grades
# Assign names to values of grades
names(grades) <- c('Math', 'Physics', 'English', 'Literature')
grades # Output the vector of grades

              
1234

            
grades <- c(80, 75, 95, 100) # Vector of grades
# Assign names to values of grades
names(grades) <- c('Math', 'Physics', 'English', 'Literature')
grades # Output the vector of grades
copy

Here, c('Math', 'Physics', 'English', 'Literature') is the vector of names (labels). As you can see, using this approach, we can present the information more clearly.

Tarefa

Swipe to start coding

Imagine you manage a local furniture store. You have a list of items and their respective prices, as shown below:

ItemPrice
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.

  1. Construct a vector of prices and store it in the variable prices.
  2. Use the variable items to assign names to the elements in the prices vector.
  3. Display the prices vector.

Solução

# Create vector of prices
prices <- c(340, 150, 115, 45, 160)
# Vector of items
items <- c('Sofa', 'Armchair', 'Dining table', 'Dining chair', 'Bookshelf')
# Assign names to prices' items
names(prices) <- items
# Output the vector
prices

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Seção 2. Capítulo 6
# Create vector of prices
___ <- ___
# Vector of items
items <- c('Sofa', 'Armchair', 'Dining table', 'Dining chair', 'Bookshelf')
# Assign names to prices' items
___(___) <- items
# Output the vector
___
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