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Indexing in Vectors | Basic Data Types and Vectors
R Introduction: Part I

Indexing in Vectors

Great! Now you understand how to create a vector and assign names to its values.

To access specific elements within a vector, you can use indices. The index of the first element is 1, the second element is 2, and so on. To retrieve the n-th element from a vector vec, use the syntax vec[n]. Additionally, if the vector elements have assigned names, you can extract the values by their names by enclosing the name in quotes and square brackets.

Now, let’s revisit the grades example:

Subject Grade
Math 80
Physics 75
English 95
Literature 100

We'll extract the grade for Math and the grade for Literature.

It's also possible to access multiple elements simultaneously:

Tarefa

Continuing from the previous exercise, you have a vector named prices with each price assigned to a corresponding item name.

  1. Retrieve the price of 'Armchair' using its name rather than its index.
  2. Retrieve the prices for both the 'Dining table' and 'Dining chair' using their indices.

Tudo estava claro?

Seção 2. Capítulo 7
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Conteúdo do Curso

R Introduction: Part I

Indexing in Vectors

Great! Now you understand how to create a vector and assign names to its values.

To access specific elements within a vector, you can use indices. The index of the first element is 1, the second element is 2, and so on. To retrieve the n-th element from a vector vec, use the syntax vec[n]. Additionally, if the vector elements have assigned names, you can extract the values by their names by enclosing the name in quotes and square brackets.

Now, let’s revisit the grades example:

Subject Grade
Math 80
Physics 75
English 95
Literature 100

We'll extract the grade for Math and the grade for Literature.

It's also possible to access multiple elements simultaneously:

Tarefa

Continuing from the previous exercise, you have a vector named prices with each price assigned to a corresponding item name.

  1. Retrieve the price of 'Armchair' using its name rather than its index.
  2. Retrieve the prices for both the 'Dining table' and 'Dining chair' using their indices.

Tudo estava claro?

Seção 2. Capítulo 7
toggle bottom row
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