In case you need to plot your R graphic using non-US characters or LATIN-1 (French/Spanish/Portuguese) accent (vowels+acute), than you need to plot using Unicode standard codes.

For example, to plot the ‘e’ with acute symbol “é” you need to add the respective code \u{E9} in the label option:

Here some code

plot(xdata,ydata, main="Testing Unicodes: \u{E7}, \u{D8}", xlab="Where is my e with acute? \u{E9}", ylab="Unicodes")

The output should be like that

unicode sample

You can get all UNICODES at

Another option would be setting your shell environment to your specific language, before launch R :D. In my case, is the Brazilian Portuguese (Português do Brasil – pt_BR)

export LANG=pt_BR.UTF-8
export LANGUAGE=pt_BR:en

I made a test using a FreeBSD server with en_US support language:

[kaiorafael@n1: ~ $] lu
-bash: lu: command not found
[kaiorafael@n1: ~ $] export LANG=pt_BR.UTF-8
[kaiorafael@n1: ~ $] export LANGUAGE=pt_BR:en
[kaiorafael@n1: ~ $] lu
-bash: lu: comando não encontrado
[kaiorafael@n1: ~ $]

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