How to reshape a data frame from wide to long format in r?

如何重塑一个数据框的长宽格式r ？

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Long form command line options have a similar yet slightly different format.

长形式命令行选项采用相似但略有差异的格式。

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Enter the new name and type-in format as totalEntries: long, and press Enter.

键入新名称和输入格式为totalEntries:long，然后按下Enter键。

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Enter the new name and type-in format as totalEntries: long, and press Enter.

键入新名称和输入格式为totalEntries:long，然后按下Enter键。

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