Calculating the worldwide box office
The single most important thing for a movie in order to become an instant legend in Tinseltown is its worldwide box office figures.
To calculate the total box office revenue for the three Star Wars movies, you have to take the sum of the US revenue column and the non-US revenue column.
In R, the function rowSums() conveniently calculates the totals for each row of a matrix. This function creates a new vector:
rowSums(my_matrix)
This exercise is part of the course
Introduction to R
Exercise instructions
Calculate the worldwide box office figures for the three movies and put these in the vector named worldwide_vector.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Construct star_wars_matrix
box_office <- c(460.998, 314.4, 290.475, 247.900, 309.306, 165.8)
region <- c("US", "non-US")
titles <- c("A New Hope",
"The Empire Strikes Back",
"Return of the Jedi")
star_wars_matrix <- matrix(box_office,
nrow = 3, byrow = TRUE,
dimnames = list(titles, region))
# Calculate worldwide box office figures
worldwide_vector <-