[英]R: How to pass a list of selection expressions (strings in this case) to the subset function?
以下是一些示例數據:
data = data.frame(series = c("1a", "1b", "1e"), reading = c(0.1, 0.4, 0.6))
> data
series reading
1 1a 0.1
2 1b 0.4
3 1e 0.6
我可以使用子集提取選擇性的單行:
> subset (data, series == "1a")
series reading
1 1a 0.1
並使用邏輯OR提取多行
> subset (data, series == "1a" | series == "1e")
series reading
1 1a 0.1
3 1e 0.6
但是,如果我有很長的系列表達式列表,那么輸入起來會很煩人,所以我寧願以更好的方式定義它們,如下所示:
series_you_want = c("1a", "1e") (although even this sucks a little)
並能夠做這樣的事情,
subset (data, series == series_you_want)
以上顯然失敗了,我不確定執行此操作的最佳方法是什么?
您可能需要%in%
運算符
> dat <- data.frame(series = c("1a", "1b", "1e"), reading = c(0.1, 0.4, 0.6))
> series_you_want <- c("1a", "1e")
> subset(dat, series %in% series_you_want)
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