How to remember point shape codes in R

April 24, 2012
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(This article was first published on Win-Vector Blog » R, and kindly contributed to R-bloggers)

I suspect I am not unique in not being able to remember how to control the point shapes in R. Part of this is a documentation problem: no package ever seems to write the shapes down. All packages just use the “usual set” that derives from S-Plus and was carried through base-graphics, to grid, lattice and ggplot2. The quickest way out of this is to know how to generate an example plot of the shapes quickly. We show how to do this in ggplot2. This is trivial- but you get tired of not having it immediately available.

library(ggplot2)
ggplot(data=data.frame(x=c(1:16))) + geom_point(aes(x=x,y=x,shape=x))

Symbols1
Or if you are feeling more daring:

ggplot(data=data.frame(x=c(1:16))) + geom_point(aes(x=x,y=x,shape=x)) +
   facet_wrap(~x,scales='free')

Symbols2

Related posts:

  1. Your Data is Never the Right Shape
  2. The cranky guide to trying R packages
  3. My Favorite Graphs

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