Question

I have a vector of integers, e.g.: 2,8,11,19.

I would like to plot a line of length e.g. 20 then plot a dot for each value that exist in the list (at some constant height), so I get something like this:

-+-----+--+-------+-

Answer 1

Brandon Bertelsen is really close…

x <- c(2,8,11,19)
x <- data.frame(x,1) ## 1 is your "height"
plot(x, type = 'o', pch = '|', ylab = '')

But I wrote this mostly to mention that you might also in base graphics look at stripchart() and rug() for ways to look at 1-d data.