使用变量名称在R中创建向量

Question

I have a variable called school_name

I am creating a vector to define colors that I will use later in ggplot2.

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

In my code I am using the variable school_name for some logic want to add that as the third element of my vector. The value changes in my for loop and cannot be hard-coded.

I have tried the following but it does not work.

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

Please can someone help me with this

Answer 1

You can just set the names of the colors using names() :

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

Answer 2

You can use structure :

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

Answer 3

This also works:

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