Question

Is it possible to plot a matrix of scatter plots with ggplot2, using ggplot‘s nice features like mapping additional factors to color, shape etc. and adding smoother?

I am thinking about something similar to the base function pairs.

Answer 1

You might want to try plotmatrix:

  library(ggplot2)
  data(mtcars)
  plotmatrix(mtcars[,1:3])

to me mpg (first column in mtcars) should not be a factor. I haven’t checked it, but there’s no reason why it should be one. However I get a scatter plot 🙂

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Note: For future reference, the plotmatrix() function has been replaced by the ggpairs() function from the GGally package as @naught101 suggests in another response below to this question.