1/12/2024 0 Comments Ggplot annotate textThere’re many ways to achieve this but I like a combination of levels and id. The second information piece is the faceted variable labels (in our case gear ~ am). Generally I find that one set of coordinates will work in most of the facet boxes and I just use rep to make these coordinates (I suppose the recycling rule could be used if you added it to an already existing data frame). The first information piece is the coordinates (two columns x and y) to plot the text in each facet. The key here is a new data frame with three pieces of information (ggplot2 seems to like information given in a data frame). I reclassed a few variables to make factors. Section 2: A Bit of Explanation The following portion of the tutorial provides a bit more of a step by step procedure for plotting text to faceted plots as well as a visual to go with the code.įirst, let’s make a faceted line plot with the mtcars data set. P + geom_text(aes(x, y, label=paste("beta =", labs), group=NULL), size = 4, P + geom_text(aes(x, y, label=labs, group=NULL), data=dat) P + geom_text(aes(x, y, label=labs, group=NULL),data=dat)ĭat <- c(30, 2) #to change specific locations Vars <- ame(id(levels(mtcars$gear), levels(mtcars$am)))ĭat <- ame(x = rep(15, len), y = rep(5, len), vars, labs=LETTERS) Len <- length(levels(mtcars$gear)) * length(levels(mtcars$am)) P <- ggplot(mtcars, aes(mpg, wt, group = cyl)) + Section 1: The Complete Code and Final Outcome mtcars <- lapply(mtcars, as.factor) Hopefully, whatever learner you are you’ll be plotting text on faceted graphics in no time. I’ve broken the following tutorial on plotting text on faceted ggplot2 plots into 2 sections: The “show me the code and what it does and let me play” type and the “please give me step by step directions” type. # stringi_1.7.6 munsell_0.5.0 crayon_1.5.In my experience with R learners there are two basic types. # loaded via a namespace (and not attached): # stats graphics grDevices utils datasets methods base # LC_MONETARY=German_Germany.utf8 LC_NUMERIC=C # LC_COLLATE=German_Germany.utf8 LC_CTYPE=German_Germany.utf8 # Running under: Windows 10 圆4 (build 22000) # R Under development (unstable) ( r81760 ucrt) We simply call this function with a LaTeX math expression and receive the corresponding plotmath expression: Latex2exp’s main workhorse is the TeX() function. Latex2exp package fulfills exactly this need by translating math expressions specified in LaTeX format into R’s mathplot format. Plotmath, whose syntax has always intimidated me somewhat.Įven to construct relatively simple equations like \(\binom $ – much easier, at least for me! R’s internal system for math annotations is I often need to create figures with mathematical expressions for scientific publications. Publications Teaching CV Blog Math annotations in ggplot2 with latex2exp
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