r - How do you label a horizontal line when the x axis is categorical? -

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One shows how to label a straight line in R by using ggplot2. Please see Example 5 - "Rebuild the following conspiracy of the amount of flight by the longitude".

If X-axis is clarified instead of continuous, how do you code? 

  data = data.frame (x = - 119, y = 0)   
 How to I have created a line  
  + geom_text (AES (X, Y, label = "serial"), data = data.frame (x = 1, y = 20), size = 4, And I tried several options  
  data = data.frame (x = 1, Y = 20) data = data.frame (x = factor (1), y = 20) #where gard is the name of a data in categories = data.frame (x = "gard", y = 20)   
 ... but I get an error  
 
 Invalid argument for inappropriate operator    
 
 
 It is not completely clear what you are trying to do, because you say that you try to make a line, and then your code  geom_text  Using a specific x variable, assuming that you want to keep a vertical line, with a text label on the vertical line on that line, here is a simple example:  
 < Code> dat & lt; - data.frame (X = letters [1: 5], y = 1: 5) txt & lt; Ggplot (dat, aes (x = x, y = y)) + geom_point () + geom_vline (xintercept = 1.5) + geom_text (data = frames (x = 1.5, y = 1, lab = "label" Txt, AES (label = lab), angle = 90, hjust = 0, vjust = 0)   
 This output on my machine produces:  
 Enter image details here  
 Note that I have a text label in a different data frame, Em> out   ggplot  in the call. It is not strictly necessary, but I like it because I think it avoids the illusion.  
 Using the X value of 1.5 for the text label works here, as you'd like, you want to set "a" on the directly-drawn X values.  
 The error you are describing for me has suggested a simple syntax error (which you have not provided completely) anywhere in your code. Perhaps this example will help you find it.

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