> plot(1:10, xlab = expression(NO[3]^-~(mg/L)))
It's unexpected but not inexplicable.
The difficulty is that the superscript begins with a unary minus operator. It
_must_ have something (number or variable) after it to negate. Since the thing
following the '-' is not a number, plotmath has just taken the entire following
string as part of an unlikely (but technically possible) variable name
"~(mg/L)".
Rui Barradas' corrected form creates the '-' as a string, preventing the
inappropriate mathematical interpretation.
You don't actually _need_ the enclosiong {}, though;
> expression(NO[3]^'-'~(mg/L))
works as you intended
S Ellison
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