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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?
446
To add new points to an existing plot, use the points() function. The points function has many similar arguments to the plot() function, like x (for the x-coordinates), y (for the y-coordinates), and parameters like col (border color), cex (point size), and pch (symbol type).
To put labels directly in the ggplot2 plot we add data related to the label in the data frame. Then we use functions geom_text() or geom_label() to create label beside every data point. Both the functions work the same with the only difference being in appearance.
In ggplot2 we can add lines connecting two data points using geom_line() function and specifying which data points to connect inside aes() using group argument.
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")
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