R help - Jan 2013 - Using square brackets in a ploted expression

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?

Thank you in advance,
José

	[[alternative HTML version deleted]]

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,
> Jos?
>
> 	[[alternative HTML version deleted]]
>
>
>
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