如何在 R 中创建一个标志，并在新列中输出

Question

我有以下数据框

all <- c("a","a","a","a","a","a","a","d","d","d","c","c","c","c")

我想创建一个列，将数据集中的条目全部标记为输出应该在另一列中让我们说 all$call，数据中的每个 a 的组都标记为好，d 更好，c 最好

谁能告诉我如何在 r 编程中做到这一点。提前致谢

Answer 1

您可以使用case_when 函数。

假设你的条目是一个向量：

entry <- c("a","a","a","a","a","a","a","d","d","d","c","c","c","c")

然后你可以简单地在一个新的向量中得到你想要的输出：

output <- case_when(
  entry == 'a' ~ "good",
  entry == 'd' ~ "better",
  entry == 'c' ~ "best"
)

您可以在case_whenhttps://www.rdocumentation.org/packages/dplyr/versions/0.7.2/topics/case_when找到更多信息