Adding an extra point in a ggplot2 graph

Question

I have created a plot of the Sepal.Length and the Sepal.Width (using the iris dataset) with ggplot2.

  ggplot(iris, aes(x = Sepal.Width, y = Sepal.Length, col = Species)) + geom_point()

Works fine but now I would like to add a seperate point to the graph with a blue color. So for example:

  df = data.frame(Sepal.Width = 5.6, Sepal.Length = 3.9)

Any thoughts on how I can accomplish this?

erc · Accepted Answer · 2016-04-11 06:24:16Z

36

Add another layer:

ggplot(iris, aes(x = Sepal.Width, y = Sepal.Length, col = Species)) + 
  geom_point() +
  geom_point(aes(x=5.6, y=3.9), colour="blue")

answered Apr 11, 2016 at 6:24

erc

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1 Comment

Zimano Over a year ago

I suspect this plots as many points in the same location as the amount of points being plotted. I had 7.1 million integers, and this slowed the plot generation down by about 30 seconds compared to annotate! Trying this with geom_text slowed it down more, with the text constantly flickering, as if being redrawn.

rawr · Accepted Answer · 2016-04-11 06:25:36Z

19

library('ggplot2')

df = data.frame(Sepal.Width = 5.6, Sepal.Length = 3.9) 

ggplot(iris, aes(x = Sepal.Width, y = Sepal.Length, col = Species)) +
  geom_point() +
  geom_point(data = df, col = 'blue')

answered Apr 11, 2016 at 6:25

rawr

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Comments

zx8754 · Accepted Answer · 2021-03-26 22:42:26Z

19

Using annotate:

ggplot(iris, aes(x = Sepal.Width, y = Sepal.Length, col = Species)) + 
  geom_point() +
  annotate("point", x = 5.6, y = 3.9, colour = "blue")

edited Mar 26, 2021 at 22:42

answered Apr 11, 2016 at 6:23

zx8754

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