kumpulkan fungsi di r

df %>%
  gather('a','b',key='whatever',value='whatever')
  
  
#df: the data frame you want to gather
#a and b: the columns of the old data frame that you want to turn into variables
#key: what to call the column of the new data frame that stores the variables
#value: what to call the column of the new data frame that stores the values
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