[英]How to remove all rows belonging to a particular group when only one row fulfills the condition in R?
[英]How to delete all rows except those belonging to more than one group
對於選擇特定組, %in%
比grep()
/ grepl()
更具體。
df[df$group %in% c('a', 'c'), ]
或者
subset(df, group %in% c('a', 'c'))
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