[R] Using square brackets in a ploted expression

[Uwe Ligges]

On 11.01.2013 13:43, Monteiro, Jose wrote:
> Dear Users,
>
> I have the following text plotted inside a graphic:
>
>
> text(16200, 2.8*0.97, expression(NH[3]==0.33-1.1 %*% 10^-5 %*% day),
>
> adj=c(1,1))
>
> I need to include square brackets in the expression around the ammonia to have it plotted like that: [NO3-]. I tried instinctively to use %[% to plot the brackets, but it did not work. Does anybody of you know what is the correct syntax to plot square brackets inside an expression?


See ?plotmath:

plot(1, main=expression(group("[", NO[3]^"-","]")))

Uwe Ligges


> Thank you in advance,
> José
>
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>
>
>
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