使用变量名在 R 中创建一个向量

Question

我有一个名为 school_name

的变量

我正在创建一个矢量来定义稍后将在 ggplot2 中使用的颜色。

colors <- c("School1" = "yellow", "School2" = "red", ______ = "Orange")

在我的代码中，我使用变量 school_name 来实现某些逻辑，希望将其添加为向量的第三个元素。我的 for 循环中的值发生变化，不能硬编码。

我尝试了以下方法，但它不起作用。

colors <- c("School1" = "yellow", "School2" = "red", get("school_name") = "Orange")

有人可以帮我解决这个问题

Answer 1

您可以使用 names():

设置颜色名称

colors <- c("yellow", "red", "orange")
names(colors) <- c("School1", "School2", school_name)

Answer 2

您可以使用 structure:

school_name = "coolSchool"
colors <- structure(c("yellow", "red", "orange"), .Names = c("School1","School2", school_name))

Answer 3

这也有效：

school_name <- "school3"
colors <- c("School1" = "yellow", "School2" = "red")
colors[school_name] <- "Orange"
# School1  School2  school3 
# "yellow"    "red" "Orange"

使用变量名在 R 中创建一个向量

create a vector in R using variable names

r

vector

variable-assignment