awesome, works perfectly. LISP-iness to the rescue.

thanks much!

-m

On Wed, Nov 14, 2012 at 12:26 PM, William Dunlap <wdunlap@tibco.com> wrote:

> I recommend using bquote(), with its .() substitution operator, instead of
> substitute any time you use plotmath.    To make a vector of plotmath
> expressions use the following sort of as.expression(lapply(... bquote
> ...)) idiom:
>
>   plot(1:10, axes=FALSE)
>   at <- axTicks(1)
>   lab <- as.expression(lapply(at, function(a)bquote(10^.(a))))
>   axis(1, at=at, lab=lab)
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
>
> > -----Original Message-----
> > From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-project.org]
> On Behalf
> > Of Murat Tasan
> > Sent: Wednesday, November 14, 2012 9:06 AM
> > To: r-help@r-project.org
> > Subject: [R] vectorized plotmath expressions via substitute()
> >
> > hi all - i've seen versions of this question before, but none seem to get
> > directly at my solving my (probably very simple) issue:
> >
> > i simply want to annotate the tick marks on an axis with (superscripted)
> > 10^x notation, and tried this:
> >
> > axis(1, at = axTicks(1), as.expression(substitute(10^foo, list(foo =
> > axTicks(1))))
> >
> > thinking the as.expression/substitute would create the appropriate
> > expression vector from the expansion of the foo vector.
> > i'm continually stuck in the error process, however, with axis() where R
> > complains that i've only provided a single label.
> > i must be missing a function that explicitly "unfolds"(?) the result of
> the
> > substitute() call, without actually evaluating the contents of that call?
> >
> > sorry in advance if this is clear in the docs somewhere, though i just
> > can't seem to locate it :-/
> >
> > cheers and thanks for any pointers!
> >
> > -murat
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@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.
>

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