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R Introduction: Part I
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R Introduction: Part I

R Introduction: Part I

1. Basic Syntax and Operations
Why R?Basic ArithmeticUsing the print() Function Comments in RInteger Division and RemaindersExponentiationcat() FunctionVariablesRevenue CalculationAssignment Operators
2. Basic Data Types and Vectors
Data TypesNumbersType ConversionLogical TypesVectorsLabeling VectorsIndexing in VectorsModifying VectorsDeleting Elements from VectorsArithmetic Operations with Vectors
3. Factors
What is a Factor?Indexing in FactorsLevelsCounting ValuesGrouping Numeric DataGrades Summary

bookDeleting 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:


              
12345

            
# Vector of grades and names
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')
# Remove the third element
grades[-3]
copy

Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:


              
12345

            
# 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)]
copy

Tarefa

From the previous task, you have the prices vector with the prices of 6 items. Your task is:

  1. Remove the 'Dining chair' item from the prices vector. This item is the fourth in the vector. Save the changes by reassignment.
  2. Display the modified prices vector.

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Seção 2. Capítulo 9
toggle bottom row

bookDeleting 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:


              
12345

            
# Vector of grades and names
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')
# Remove the third element
grades[-3]
copy

Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:


              
12345

            
# 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)]
copy

Tarefa

From the previous task, you have the prices vector with the prices of 6 items. Your task is:

  1. Remove the 'Dining chair' item from the prices vector. This item is the fourth in the vector. Save the changes by reassignment.
  2. Display the modified prices vector.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 2. Capítulo 9
toggle bottom row

bookDeleting 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:


              
12345

            
# Vector of grades and names
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')
# Remove the third element
grades[-3]
copy

Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:


              
12345

            
# 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)]
copy

Tarefa

From the previous task, you have the prices vector with the prices of 6 items. Your task is:

  1. Remove the 'Dining chair' item from the prices vector. This item is the fourth in the vector. Save the changes by reassignment.
  2. Display the modified prices vector.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

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:


              
12345

            
# Vector of grades and names
grades <- c(80, 75, 95, 100)
names(grades) <- c('Math', 'Physics', 'English', 'Literature')
# Remove the third element
grades[-3]
copy

Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:


              
12345

            
# 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)]
copy

Tarefa

From the previous task, you have the prices vector with the prices of 6 items. Your task is:

  1. Remove the 'Dining chair' item from the prices vector. This item is the fourth in the vector. Save the changes by reassignment.
  2. Display the modified prices vector.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 2. Capítulo 9
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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