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

Use the col= argument which is vectorized so that eg in

 plot(1:5, 1:5, col=1:5)

you get five points in five different colors:

You can use the same logic to use just two or three colors among your data points. Understanding indexing is key in languages like R.