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並前往https://www.r-tutor.com/r-introduction/data-frame/data-frame-column-slice

Data Frame Column Slice | R Tutorial

Numeric Indexing. The following is a slice containing the first column of the built-in data set mtcars. > mtcars[1] mpg. Mazda RX4 21.0. Mazda RX4 Wag 21.0

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