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  3. Joining Data with data.table in R

Exercise

Finding multiple matches

Two new data.tables have been loaded in your workspace:

  • life_exp: contains the life expectancy of each country in 2010 sourced from the Gapminder foundation
  • continents: contains a mapping between each country and the continent(s) they are part of built from information provided by Countries-ofthe-World.com.

In this exercise, you will find the countries that are listed in more than one continent

Instructions 1/2

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Complete the code to build a data.table containing the number of matches in continents for each row in life_exp.