Reshape2 and Tidyr

• Reshape2 is an R package written by Hadley Wickham that makes it easy to transform data between wide and long formats.
• tidyr replaces reshape2 (2010-2014) and reshape (2005-2010).
• tidyr is designed specifically for tidying data, not general reshaping (reshape2), or the general aggregation (reshape).

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summary(cars)

     speed           dist       
 Min.   : 4.0   Min.   :  2.00  
 1st Qu.:12.0   1st Qu.: 26.00  
 Median :15.0   Median : 36.00  
 Mean   :15.4   Mean   : 42.98  
 3rd Qu.:19.0   3rd Qu.: 56.00  
 Max.   :25.0   Max.   :120.00