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R 的 data frame 怎么提取一列
source link: https://yihui.org/cn/2007/08/extract-a-column-in-r-data-frame/
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R 的 data frame 怎么提取一列
谢益辉 / 2007-08-14
看了这个帖子 https://cosx.org/cn/topic/7393，把我笑喷了。楼主莫介意，丝毫没有取笑的意思。rtist 一定哭笑不得，急坏了。
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