It is possible to change the color following the value of a variable. You can use the ifelse statement for that.
Learn more about color management in R in the dedicated section.
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# Create data data=data.frame( my_x = 1:100 + rnorm(100,sd=9), my_y = 1:100 + rnorm(100,sd=16) ) # Add the plot plot(data$my_x , data$my_y, col=ifelse(data$my_x>50,"red","skyblue") , lwd=3 , xlab="value of X" , ylab="value of Y" ) # Add a vertical line abline(v=50 , col="grey") |
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