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  3. Joining Data with data.table in R
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연습 문제

Splitting by multiple groups

gdp_by_industry_oceania contains the GDP generated by the agriculture and tourism industries in both 1995 and 2010. Your goal is to create a wide format data.table containing columns of GDP for each year and industry.

지침

100 XP
  • Print gdp_by_industry_oceania.
  • Convert gdp_by_industry_oceania to a wide format with each country as a row, splitting the "gdp" column so that the result has columns containing the gdp for each industry and each year.