如何使用上标与ggplot2

Question

如何在x轴上打印埃方形？我尝试如下。我真的很抱歉我的简单问题。

    public class LoginModel : ViewModelBase
    {

    public string txtLabel_IsFocused { get; set; }                 
    public string butEdit_IsEnabled { get; set; }                


    public void SetProperty(string PropertyName, string value)
    {
        System.Reflection.PropertyInfo propertyInfo = this.GetType().GetProperty(PropertyName);
        propertyInfo.SetValue(this, Convert.ChangeType(value, propertyInfo.PropertyType), null);
        OnPropertyChanged(PropertyName);
    }                


    private void Example_function(){

        SetProperty("butEdit_IsEnabled", "False");
        SetProperty("txtLabel_IsFocused", "True");        
    }

    }

Answer 1

我们可以使用bquote

library(ggplot2)
ggplot(mtcars, aes(hp, mpg)) + 
       geom_point() +
       labs(x = bquote('x axis'~(Å^2)), y = "y axis") +
       #or
       #labs(x = bquote('x axis'~(ring(A)^2)), y = "y axis") 
       theme_bw()

Answer 2

你应该使用表达式，最好结合粘贴，如下所示：

ggplot(mtcars, aes(hp, mpg)) + geom_point() + labs(x = expression(paste("x axis ", ring(A)^2)), y = "y axis")