Attributes

You have made it to the last exercise in the course! Congrats! Let's finish up with an easy one.

Attributes are a bit of extra metadata about your data structure. Some of the most common attributes are: row names and column names, dimensions, and class. You can use the attributes() function to return a list of attributes about the object you pass in. To access a specific attribute, you can use the attr() function.

Exploring the attributes of cash:

attributes(cash)

$names
[1] "company"   "cash_flow" "year"     

$row.names
[1] 1 2 3 4 5 6 7

$class
[1] "data.frame"

attr(cash, which = "names")

[1] "company"   "cash_flow" "year"

This exercise is part of the course

Introduction to R for Finance

View Course

Exercise instructions

The matrix my_matrix and the factor my_factor are defined for you.
Use attributes() on my_matrix.
Use attr() on my_matrix to return the "dim" attribute.
Use attributes() on my_factor.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# my_matrix and my_factor
my_matrix <- matrix(c(1,2,3,4,5,6), nrow = 2, ncol = 3)
rownames(my_matrix) <- c("Row1", "Row2")
colnames(my_matrix) <- c("Col1", "Col2", "Col3")

my_factor <- factor(c("A", "A", "B"), ordered = T, levels = c("A", "B"))

# attributes of my_matrix


# Just the dim attribute of my_matrix


# attributes of my_factor

Edit and Run Code