Mu is rendered as just an "m" in pdf

Hi there,

I am wanting to use the greek letter mu in text and titles. Example:

"Particle Diameter [", mu, "m]"

But it keeps rendering as just "mm" when I print to pdf

We need a reproducible example (reprex)

A handy way to supply sample data is to use the dput() function. See ?dput. If you have a very large data set then something like head(dput(myfile), 100) will likely supply enough data for us to work with.



pdf(file = "C:/Users/PSD1.pdf", family = "CM Roman", height = 5, width = 7)
par(family = "CM Roman")

plot(my_pow$PD_1, my_pow$Fre_1, xlab = expression(paste("Particle Diameter [", mu, "m]")), ylab = "Volume Frequency [%]", type = "l", col = "red", xaxp = c(0, 130, 13), yaxp = c(0, 6.5, 13), xlim=c(0, 130), ylim=c(0, 6.5))
embed_fonts(file = "C:/Users/PSD1.pdf")

The data in the my_pow file is irrelevant as I'm having problems just with the Mu greek letter in the title of plots.


R needs some persuading to show Greek letters. Try the latex2exp package and something like


Thanks for the help.

This suggestion works if I comment out the embed in pdf lines, but doesn't show up in the pdf if I run the code to print to pdf?

Any suggestions to get the greek letters printing correctly to pdf in CMU Serif font?

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