Question

I know I can create a plot with line and dots using the type = “o” argument in the plot command. I would like some more control over this — I want to be able to draw the “o” as full dots, with black border and fill-in color of my choice, of customized size and of a different color than the line. Same for the line, I want to make it thicker, and of my choice of color. How would I go on about doing that?

What I found until now is just a plain

 plot(y, type= "o")

which is too poor for my needs.

I am not interested in using ggplot, but instead use the internal plot library of R.
Any help appreciated.

Answer 1

You could use layering (I don’t work in base too much any more as a social researcher I love the facet_grid of ggplot, so there may be a better way) as in:

x <- sort(rnorm(25))
y <- sort(rnorm(25))
z <- as.factor(sample(LETTERS[1:5], 25, r=TRUE))

plot(x, y, pch = 19, cex = 1.3)
par(new = TRUE)
plot(x, y, pch = 19, cex = 1, col = z)

Which gives you: