[R] variable values in plotmath expressions

[Joshua Wiley]

Hi Rich,

I'm not sure if you have a reason outside this toy example to want to
be using list() and group(), but if not I would go with this:

xyplot(y ~ x, main = substitute(expression(alpha == p), list(p = pval)))

Hope this helps,

Josh

On Thu, Mar 15, 2012 at 7:25 PM, Richard M. Heiberger <rmh at temple.edu> wrote:
> ## I would like help in using variable values in plotmath expressions
> ## in lattice
>
> x <- 1:10
> y <- 1:10
> pval <- .95
>
> plot(y ~ x, ## works as I want in base graphics
>     main=substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
>
> plot(y ~ x, ## doesn't work as intended: "pval" is displayed
>     main=substitute(list(alpha * " = " * group("",list(pval),""))))
>
> try( ## doesn't work: object 'alpha' not found
> xyplot(y ~ x,
>     main=substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
> )
>
> xyplot(y ~ x, ## doesn't work as intended: "substitute" is displayed
>     main=expression(substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval))))
>
> xyplot(y ~ x, ## doesn't work as intended: "p" is displayed and "pval" is
> displayed
>     main=expression(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
>
> xyplot(y ~ x, ## doesn't work as intended: "pval" is displayed
>     main=expression(list(alpha * " = " * group("",list(pval),""))))
>
>
> Thanks
> Rich
>
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>
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, Statistical Consulting Group
University of California, Los Angeles
https://joshuawiley.com/