Using R, how do I make a column of a dataframe the dataframe's index? Lets assume I read in my data from a .csv file. One of the columns is called 'Date' and I want to make that column the index of my dataframe.Using R, how do I make a column of a dataframe
阅读背景：
将数据框架列设置为R Data . Frame对象的索引。
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