Kursusindhold
R Introduction: Part I
R Introduction: Part I
Deleting Elements from Vectors
Since you've learned how to add elements to a vector, it's only natural to learn how to remove them as well. Everything builds up to this.
To remove an element from a vector, use the - sign before the index of the element you wish to remove. Remember, this action doesn't directly overwrite your vector, so reassignment is usually necessary. To remove multiple elements, you can provide a vector of indices after the - sign. For instance, to remove the third element from the grades vector, the operation would look like this:
# Vector of grades and names grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Remove the third element grades[-3]
Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:
# Vector of grades and names grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Remove the second and fourth elements grades[-c(2,4)]
Swipe to start coding
From the previous task, you have the prices vector with the prices of 6 items. Your task is:
- Remove the
'Dining chair'item from thepricesvector. This item is the fourth in the vector. Save the changes by reassignment. - Display the modified
pricesvector.
Løsning
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående mulighederTak for dine kommentarer!
Deleting Elements from Vectors
Since you've learned how to add elements to a vector, it's only natural to learn how to remove them as well. Everything builds up to this.
To remove an element from a vector, use the - sign before the index of the element you wish to remove. Remember, this action doesn't directly overwrite your vector, so reassignment is usually necessary. To remove multiple elements, you can provide a vector of indices after the - sign. For instance, to remove the third element from the grades vector, the operation would look like this:
# Vector of grades and names grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Remove the third element grades[-3]
Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:
# Vector of grades and names grades <- c(80, 75, 95, 100) names(grades) <- c('Math', 'Physics', 'English', 'Literature') # Remove the second and fourth elements grades[-c(2,4)]
Swipe to start coding
From the previous task, you have the prices vector with the prices of 6 items. Your task is:
- Remove the
'Dining chair'item from thepricesvector. This item is the fourth in the vector. Save the changes by reassignment. - Display the modified
pricesvector.
Løsning
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående mulighederTak for dine kommentarer!
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder