Identifying observations unique to a table
An additional data.table has been loaded into your R session, middle_east, along with the gdp list of data tables from the previous exercise. The middle_east data table contains the set of countries in the Middle East, a geopolitical region which spans parts of Europe, Africa, and Asia. All countries in the middle_east data table appear in one or more data tables in the gdp list. Your goal is to print data tables containing all countries in Africa, Europe, and Asia, that are not found in the middle_east.
Cet exercice fait partie du cours
Joining Data with data.table in R
Instructions
- Print a new
data.tablecontaining rows fromgdp$africathat are not present inmiddle_east. - Print a new
data.tablecontaining rows fromgdp$asiathat are not present inmiddle_east. - Print a new
data.tablecontaining rows fromgdp$europethat are not present inmiddle_east.
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
# Which countries are in Africa but not considered part of the middle east?
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# Which countries are in Asia but not considered part of the middle east?
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# Which countries are in Europe but not considered part of the middle east?
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