How to change points individually in plot with for loop having if() inside? R -

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I have to make a digit color in conspiracy red if the value of "y" is below zero, otherwise green but thus all Dots get the same color I have tried the following: 

  x   
 but they are all green:  
 Image details here Enter    
 
 
 You pass  to the color vector (one for every point) For ifelse :  
  set.seed (1492) # random number generation reproducible X & lt; -c (rnorm (100,) y & lt; -c (rnorm (100)) x & lt; - sort (x, decreasing = FALSE) y & lt; - Sort (y, decrement = FALSE) plot (x, Y, col = ifelse (y & lt; 0, "red", "green"))   
  Enter image details here

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