如何根据值对表进行子集,并返回这些值?这只会返回索引:
with(chickwts, table(feed))
with(chickwts, table(feed)) > 11
which(with(chickwts, table(feed)) > 11)
输出
> with(chickwts, table(feed))
feed
casein horsebean linseed meatmeal soybean sunflower
12 10 12 11 14 12
> with(chickwts, table(feed)) > 11
feed
casein horsebean linseed meatmeal soybean sunflower
TRUE FALSE TRUE FALSE TRUE TRUE
> which(with(chickwts, table(feed)) > 11)
casein linseed soybean sunflower
1 3 5 6
with(chickwts, table(feed)[table(feed) > 11])
- A5C1D2H2I1M1N2O1R2T1