Produce Authentic Math Formulas in R Graphics
[This article was first published on Statistics, R, Graphics and Fun » R Language, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
I remember a few weeks ago, there was a challenge in the R-help list to make the prime symbol in R graphics. In LaTeX, we simply write $X'$ or $X^\prime$. R has a rough support for math expressions (see demo(plotmath)) and they are certainly unsatisfactory for LaTeX users. In fact we can write native LaTeX code in R plots via the tikzDevice package! Why bother to use all kinds of tricks to cheat R? 
Here is an example per request of a reader of my blog:
library(tikzDevice)
options(tikzMetricPackages = c("\\usepackage[utf8]{inputenc}",
"\\usepackage[T1]{fontenc}", "\\usetikzlibrary{calc}",
"\\usepackage{amssymb}"))
## I need the amssymb package because I use \mathcal and \mathbb
tikz("formula.tex", width = 4, height = 4, standAlone = TRUE,
packages = c("\\usepackage{tikz}",
"\\usepackage[active,tightpage,psfixbb]{preview}",
"\\PreviewEnvironment{pgfpicture}",
"\\setlength\\PreviewBorder{0pt}",
"\\usepackage{amssymb}"))
par(mar = c(4, 4, 0.1, 0.1), mgp = c(2, 0.9, 0))
plot(1, type = "n", xlab = "$x_1$", ylab = "$x_2$")
text(1, c(0.8, 1, 1.2), c("$\\underbrace{1,2,\\cdots,10}_{10}$",
"$\\mathbb{ABCDEFG}$", "$\\mathcal{HIJKLMN}$"), cex = 2.5)
dev.off()
tools::texi2dvi("formula.tex", pdf = TRUE)
system(paste(getOption("pdfviewer"), "formula.pdf"))
Related Posts
To leave a comment for the author, please follow the link and comment on their blog: Statistics, R, Graphics and Fun » R Language.
R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other topics. Click here if you're looking to post or find an R/data-science job.
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.