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並前往https://stackoverflow.com/questions/5234117/how-to-drop-columns-by-name-in-a-data-frame

How to drop columns by name in a data frame - Stack Overflow

You should use either indexing or the subset function. For example : R> df <- data.frame(x=1:5, y=2:6, z=3:7, u=4:8) R> df x y z u 1 1 2 3 4 ...

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