> nams<-c("P2O5 [%]", "D50 [mum]")
These are strings; plotmath is invoked on expressions.
Also, in an expression, [] has special meaning (it's treated as a subscripted
index), so a space followed by '[' causes an error and even if that didn't
happen, [] would not give units in square brackets.
However, there is (perhaps surprisingly) nothing wrong with horrible
constructions like
enams<-c(expression(P[2]*O[5]*" [%]"), expression("D50 ["*mu*"]"))
par(mfrow=c(2,1))
for (i in 1:2) plot(1, 1, xlab=nams[i])
# As far as plotmath is concerned, '*' is represented graphically as implicit
multiplication,
# and since it's just graphical, plotmath doesn’t care that some of the things
being multiplied
# are actually strings.
The plotmath page also has a lot of examples of programmatic substitution in
plotmath expressions; they just have to be followed very carefully.
And ?bquote is also useful for substitution in plotmath...
S Ellison
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