CODEWITHSUNDEEP
rpdfggplot2encoding
llewmills
llewmills

Reputation: 3568

encoding greek symbols in .eps and .pdf of ggplot figures

I need to save a graph created in ggplot with greek symbols as facet labels.

Here is the code for the graph

library(bayesplot)
library(ggplot2)
df <- data.frame(var1 = rnorm(1e4, 0, 1),
                 var2 = rnorm(1e4, 6, 4),
                 var3 = rnorm(1e4, 10, 3))
names(df) <- c("\u03C3", "\u03B4", "\u03BC")
tp <- bayesplot::mcmc_trace(df)
tp

Now this prints to RStudio's plot window just fine...enter image description here

...with the greek symbols coming up nicely. It also saves nicely to image files. But if I try to save to eps or pdf...

ggplot2::ggsave(filename = "plotMu.eps", 
                plot = tp, 
                device = "eps", 
                dpi = 1200, 
                width = 15,
                height = 10, 
                units = "cm")

...these greek symbols come up as double dots ..

So how do I get these symbols to show up on the eps/pdf. I have tried saving with encoding and choosing ASCII but this strategy only works for plotmath expressions and expression() statements, which doesn't really help my situation as neither of these work for column headings.

I would really appreciate someone outlining step-by-step the process for getting this done. All the explanations online tend to assume some knowledge that I don't have.

Upvotes: 8

Views: 2059

Answers (1)

Maike Morrison
Maike Morrison

Reputation: 46

I had the same problem and found that using device = cairo_ps fixed it! For example,

ggplot2::ggsave(filename = "plotMu.eps", 
plot = tp, 
device = cairo_ps, 
dpi = 1200, 
width = 15,
height = 10, 
units = "cm")

Upvotes: 3

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