R：如何将选择表达式列表（在本例中为字符串）传递给子集函数？

发布于 2024-08-27 23:13:14 字数 742 浏览 5 评论 0原文

这是一些示例数据：

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选择性单行：

> subset (data, series == "1a")
  series reading
1     1a     0.1

并使用逻辑 OR 提取多行

> subset (data, series == "1a" | series  == "1e")
  series reading
1     1a     0.1
3     1e     0.6

但是如果我有一长串系列表达式，这对输入来说真的很烦人，所以我更愿意以更好的方式定义它们，像这样：

series_you_want = c("1a", "1e")  (although even this sucks a little)

并且能够做这样的事情，

subset (data, series == series_you_want)

上面的方法显然失败了，我只是不确定最好的方法是什么？

原文

Here is some example data:

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

Which I can pull out selective single rows using subset:

> subset (data, series == "1a")
  series reading
1     1a     0.1

And pull out multiple rows using a logical OR

> subset (data, series == "1a" | series  == "1e")
  series reading
1     1a     0.1
3     1e     0.6

But if I have a long list of series expressions, this gets really annoying to input, so I'd prefer to define them in a better way, something like this:

series_you_want = c("1a", "1e")  (although even this sucks a little)

and be able to do something like this,

subset (data, series == series_you_want)

The above obviously fails, I'm just not sure what the best way to do this is?

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凝望流年 2024-09-03 23:13:14

您可能需要 %in% 运算符

> 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)

You probably want the %in% operator

> 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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