I have this
d[d$Age > "2", ]
and it returns all the rows that have an Age of over 2, but I want to only return the values in a few of the columns, say d$X and d$Y, not all of them.
anyway i can do this?
Thanks
d[d$Age > "2", c("X","Y")]
另一种方式
subset(d, Age > "2", select=c(X, Y))
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