[R] square brackets in expression in plots

[Jannis]

Dear Duncan, dear David,

thanks for the reply! I knew about Duncans solution, but could not figure out how to combine it that the 'm*s^-1' can be read from a string. Is there a way to tweak Davids suggestion in a way that this is possible?

E.g.:

a='m*s^-1'
b='speed~bgroup("[",a, "]")'
plot(1:10,main=parse(text=b)) 


Cheers
Jannis

--- David Winsemius <dwinsemius at comcast.net> schrieb am Di, 20.7.2010:

> Von: David Winsemius <dwinsemius at comcast.net>
> Betreff: Re: [R] square brackets in expression in plots
> An: "Jannis" <bt_jannis at yahoo.de>
> CC: r-help at stat.math.ethz.ch
> Datum: Dienstag, 20. Juli, 2010 18:06 Uhr
> 
> On Jul 20, 2010, at 12:42 PM, Jannis wrote:
> 
> > Dears,
> > 
> > 
> > do you know whether it is possible to include any
> square parantheses (brackets) in an expression to use it as
> an axis label?
> > 
> > e.g. I would like to have a label like (with the sub
> and superscripts correct):
> > 
> > "speed [m s^-1]"
> 
> Not exactly clear what you mean by "correct".
> > 
> > I know how to combine an expression with text via
> paste, but as I run soimething like:
> > 
> > a='m*s^{-1}'
> > plot(1:10,main=parse(text=a))
> 
> ?plotmath
> 
> This seemed to work fine with main, sub and xlab:
> 
> a='speed [m*s^-1]'
>  plot(1:10,main=parse(text=a))
> 
> But maybe you wanted the square-brackets?
> 
> a='speed~bgroup("[", m*s^-1, "]")'
> plot(1:10,main=parse(text=a))
> 
> > 
> > I found now way of doing this. I use the parse thing
> as I have all these units stored as strings that represent
> expressions.
> > 
> > 
> > Cheers for any help!
> > 
> > Jannis
> > 
> > 
> > 
> > ______________________________________________
> > R-help at r-project.org
> mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained,
> reproducible code.
> 
> David Winsemius, MD
> West Hartford, CT
> 
>