[R] strange behavior of plotmath

[Eric Berger]

FYI I see everything after the '^' as a superscript.
The '~' does act as a space. (When I omit it there is less space between
the '-' and the '('.



On Mon, May 21, 2018 at 3:09 PM, Jinsong Zhao <jszhao at yeah.net> wrote:

> hi there,
>
> I find the following codes produce strange output.
>
> plot(1:10, xlab = expression(NO[3]^-~(mg/L)))
>
> you will notice that the unit, mg/L is in superscript format.
> That means that "~" is not for space.
> However, the help page of plotmath does not mention this behavior.
>
> Best,
> Jinsong
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