[R] Using Unicode inside R's expression() command

[Sverre Stausland]

I'm using 'expression()' in R plots in order to get italicized text.
But it appears as if I cannot use Unicode symbols inside 'expression'
outside of ASCII characters. Is there some way I can work around this?
My goal is to get the 'fi' ligature in various labels in my R barplots
(together with italicized text). I think I could work around this if
there was another way of italicizing selected characters in a string
than using 'expression()'.

I'm using R for Windows version 3.0.2.

    CairoPDF(file = "Ligature1.pdf")
    plot.new()
    text(x =.5, y = .5, labels = "fi", family = "Times New Roman")
    dev.off()

    CairoPDF(file = "Ligature2.pdf")
    plot.new()
    text(x =.5, y = .5, labels = expression(paste(italic(m), "u", "fi",
italic(m), sep = "")), family = "Times New Roman")
    dev.off()
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