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r-functions-tutorial.md
R 是为处理大型数据集而构建的,数据框中的每一列都是一个向量,这意味着我们可以很容易地告诉 R 对列中的每个值执行相同的操作。 许多处理单个值的 R 函数也被矢量化。 我们可以给这些函数传递一个向量作为参数,这个函数将为向量中的每个值运行。
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