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How can I set the colour for a single data point in a scatter plot in R?
I am using plot
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Vary individual data marker colors manually On a chart, select the individual data marker that you want to change. On the Format tab, in the Shape Styles group, click Shape Fill. Do one of the following: To use a different fill color, under Theme Colors or Standard Colors, click the color that you want to use.
To change the color and the size of points, use the following arguments: col : color (hexadecimal color code or color name). For example, col = "blue" or col = "#4F6228" .
To expand on @Dirk Eddelbuettel's answer, you can use any function for col in the call to plot. For instance, this colors the x==3 point red, leaving all others black:
x <- 1:5 plot(x, x, col=ifelse(x==3, "red", "black")) 
Same goes for point character pch, character expansion cex, etc.
plot(x, x, col=ifelse(x==3, "red", "black"), pch=ifelse(x==3, 19, 1), cex=ifelse(x==3, 2, 1)) 
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