Gantt style time line plot (in base R)

Question

I have a dataframe that looks like this:

       person n start end
1         sam 6     0   6
2        greg 5     6  11
3     teacher 4    11  15
4         sa         


        

Answer 1

You say you want a base R solution, but you don't say why. Since this is one line of code in ggplot, I show this anyway.

library(ggplot2)
ggplot(dat, aes(colour=person)) + 
    geom_segment(aes(x=start, xend=end, y=person, yend=person), size=3) +
    xlab("Duration")