R language dplyr package mutate_ At function and min_ The rank function calculates the sorting sequence number value and ranking value of the specified data column in the dataframe, and assigns the ra

R Language dplyr package mutate_at Functions and min_rank Function calculation dataframe The sorting sequence number value of the data column specified in 、 Rank value 、 Set the... Of the maximum value rank The value is assigned to 1（calculate Rank for Variables）

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