Indexing Vector Elements
You can access elements of a vector by their position (numeric index) or by their assigned names.
In R, indices start at 1.
Accessing Single Element
You can extract one element at a time either by its position in the vector or by its assigned name.
Example
1234567grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # First grade grades[1] # Grade for Literature grades['Literature']
Accessing Multiple Elements
You can also select several elements at once by passing a vector of indices or names.
Example
1234567grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Second and third grades grades[c(2,3)] # Grades for Math and Physics grades[c('Math', 'Physics')]
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You have a vector named prices with each price assigned to a corresponding item name. Your task is to:
- Retrieve the price of
'Armchair'using its name rather than its index. - Retrieve the prices for both the
'Dining table'and'Dining chair'using their indices.
Solution
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Swipe to show menu
You can access elements of a vector by their position (numeric index) or by their assigned names.
In R, indices start at 1.
Accessing Single Element
You can extract one element at a time either by its position in the vector or by its assigned name.
Example
1234567grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # First grade grades[1] # Grade for Literature grades['Literature']
Accessing Multiple Elements
You can also select several elements at once by passing a vector of indices or names.
Example
1234567grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Second and third grades grades[c(2,3)] # Grades for Math and Physics grades[c('Math', 'Physics')]
Swipe to start coding
You have a vector named prices with each price assigned to a corresponding item name. Your task is to:
- Retrieve the price of
'Armchair'using its name rather than its index. - Retrieve the prices for both the
'Dining table'and'Dining chair'using their indices.
Solution
Switch to desktop for real-world practiceContinue from where you are using one of the options belowThanks for your feedback!
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