R language uses the gather function of tidyr package to convert a wide table to a long table (wide table to long table), the first parameter specifies the name of the new data column generated from th

R Language use tidyr Bag gather Function converts a wide table to a long table ( Convert wide table to long table )、 The first parameter specifies the name of the new data column generated by the original multiple data column names 、 The second parameter specifies the content value of the original table 、 The third and fourth parameters specify a constant list of column names

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