r - Setting the color for an individual data point

Question

How can I set the colour for a single data point in a scatter plot in R?

I am using plot

Answer 1

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))