Namings

In the previous chapter, you saw that list output contains indices within double square brackets. That's good, but wouldn't it be better if we had names instead of indices? Indeed, it would.

There are two ways to set names on list elements. The first is used in the process of list creation. Within list() function use name = values equalities (name should be used without quotes). For example, let's rewrite the previous example with names.

# Creating a list

test <- list(text = "Text", number = 42, logical = TRUE)

# Output list value

test


              1234
            
# Creating a list
test <- list(text = "Text", number = 42, logical = TRUE)
# Output list value
test

That's much better! The second way is to set names for the already created list. Assign a vector of names to names(list) function. For example,

# Creating a list

test <- list("Text", 42, TRUE)

# Setting names to elements

names(test) <- c('text', 'number', 'logical')

# Output list value

test


              123456
            
# Creating a list
test <- list("Text", 42, TRUE)
# Setting names to elements
names(test) <- c('text', 'number', 'logical')
# Output list value
test

Tarea

Swipe to start coding

Given the list info from the previous chapter. Using the second method (names() function), assign the following names to elements: 'Course name', 'Section', 'Chapter', 'Chapter overall'. Output the list, then.

Solución

# Create a list

info <- list("R Introduction", 6, 1, 41)

# Assign names to elements

names(info) <- c('Course name', 'Section', 'Chapter', 'Chapter overall')

# Output list value

info

¿Todo estuvo claro?

¡Gracias por tus comentarios!

Sección 3. Capítulo 2

# Create a list

info <- list("R Introduction", 6, 1, 41)

# Assign names to elements

___ <- ___ ('Course name', '___', '___', 'Chapter overall')

# Output list value

___