I would like to combine three columns in one of my data sets into one with variable name "al_anim" and remove any duplicates, rank the values (animal ids) from lowest to highest, and re-number each animal from 1 to N under the variable name "new_id".I would like to combine three columns in one of
阅读背景：
使用R将数据集中的多个列重新排列到一列中
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