Calculate Min & Max by Group & Add as New Column in R (2 Examples) | Append Variable to Data Frame

R code of this video:

gr = rep(letters[1:3], each = 3))

data_min ＜- data # Duplicate data frame
data_min$gr_min ＜- ave(data_min$val, # Calculate min by group
data_min$gr,
FUN = min)

data_max ＜- data # Duplicate data frame
data_max$gr_max ＜- ave(data_max$val, # Calculate max by group
data_max$gr,
FUN = max)

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