当我使用全局变量作为输入时，Highchart不会绘图

Question

我正在使用HighChart作为绘图工具创建一个函数。但是，当我在hcaes（）函数中使用全局变量时，没有任何内容被绘制出来。让我们以mtcars数据集为例。

x = "mpg"
y = "hp"
hchart(mtcars, "point", hcaes(x = x, y = y, group = "cyl"))

#I am also attempting
hchart(mtcars, "point", hcaes(x = eval(x), y = eval(y), group = "cyl"))

#this works but, I want to use variables rather than the actual string.
hchart(mtcars, "point", hcaes(x = "mpg", y = "hp", group = "cyl"))

#The output I would like to see is 
 x = "mpg"
 y = "hp"
 hchart(mtcars, "point", hcaes(x = x, y = y, group = "cyl"))

Answer 1

 x = "mpg"
 y = "hp"
 # x = enexpr(x) you may want to use that, not mandatory
 # y = enexpr(y) you may want to use that  not mandatory

 hchart(mtcars, "point", hcaes(x = !! x, y = !! y, group = "cyl"))

此代码应该有效