Using mutate to change or create a column

Suppose we want life expectancy to be measured in months instead of years: you'd have to multiply the existing value by 12. You can use the mutate() verb to change this column, or to create a new column that's calculated this way.

This exercise is part of the course

Introduction to the Tidyverse

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Exercise instructions

Use mutate() to change the existing lifeExp column, by multiplying it by 12: 12 * lifeExp.
Use mutate() to add a new column, called lifeExpMonths, calculated as 12 * lifeExp.

Hands-on interactive exercise

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

library(gapminder)
library(dplyr)

# Use mutate to change lifeExp to be in months


# Use mutate to create a new column called lifeExpMonths

Edit and Run Code