In R-1.8.1, I could work around the problem because the plot.formula
function is directly executable because it is exported from the graphics
package:
_
platform sparc-sun-solaris2.8
arch sparc
os solaris2.8
system sparc, solaris2.8
status Patched
major 1
minor 8.1
year 2004
month 02
day 05
language R
> methods(plot)
[1] plot.HoltWinters* plot.POSIXct plot.POSIXlt
[4] plot.TukeyHSD plot.acf* plot.data.frame
[7] plot.decomposed.ts* plot.default plot.dendrogram*
[10] plot.density plot.factor plot.formula
^^^^^^^^^^^^
[13] plot.function plot.hclust* plot.histogram
[16] plot.isoreg* plot.lm plot.mlm
[19] plot.ppr* plot.prcomp* plot.princomp*
[22] plot.profile.nls* plot.spec plot.spec.coherency
[25] plot.spec.phase plot.stl* plot.table
[28] plot.ts plot.tskernel*
Non-visible functions are asterisked
> plot.function
> plot.function
function (x, from = 0, to = 1, xlim = NULL, ...)
{
if (!is.null(xlim)) {
...
While in R-1.9.x the plot.formula function is not exported:
> version
_
platform sparc-sun-solaris2.8
arch sparc
os solaris2.8
system sparc, solaris2.8
status
major 1
minor 9.0
year 2004
month 04
day 12
language R
> methods(plot)
[1] plot.Date* plot.HoltWinters* plot.POSIXct*
[4] plot.POSIXlt* plot.TukeyHSD plot.acf*
[7] plot.data.frame* plot.decomposed.ts* plot.default
[10] plot.dendrogram* plot.density plot.ecdf
[13] plot.factor* plot.formula* plot.hclust*
[16] plot.histogram* plot.isoreg* plot.lm
[19] plot.medpolish* plot.mlm plot.ppr*
[22] plot.prcomp* plot.princomp* plot.profile.nls*
[25] plot.spec plot.spec.coherency plot.spec.phase
[28] plot.stepfun plot.stl* plot.table*
[31] plot.ts plot.tskernel*
Non-visible functions are asterisked
> plot.formula
Error: Object "plot.formula" not found
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Prof
> Brian Ripley
> Sent: Tuesday, May 25, 2004 3:45 PM
> To: Warnes, Gregory R
> Cc: 'Troels Ring'; R-devel (E-mail)
> Subject: Re: [Rd] problems with plot.formula
>
>
> As this happens in exactly the same way in 1.8.1 and 1.9.0,
> why are you
> blaming `recent changes in R 1.9.x'? I am baffled as to what
> you think is
> `recent'.
>
> On Tue, 25 May 2004, Warnes, Gregory R wrote:
>
> >
> > With the recent changes in R 1.9.x, it is now impossible to
> properly call
> > plot on a formula() where the formula is provided via a named first
> > argument. On today's R-1.9.1-alpha:
> >
> > > x <- 1:10
> > > y <- rnorm(x,0.25)
> > >
> > > plot(x~y)
> > >
> > > plot(x=x~y)
> > Error in terms.formula(formula, data = data) :
> > argument is not a valid model
> > >
> > > plot(formula=x~y)
> > Error in plot(formula = x ~ y) : Argument "x" is missing,
> with no default
> > >
> >
> > This occurs because plot.formula is no longer directly callable,
>
> It is, via graphics:::plot.formula.
No, actually it is not:
> graphics::plot.formula
Error: 'plot.formula' is not an exported object from 'namespace:graphics'
>
> > and the
> > first argument to plot.formula() is 'formula' while the
> first argument to
> > plot() is 'x'. Consequently one cannot properly pass a named first
> > argument since it will either fail for plot() or for
> plot.formula(). [I
> > suspect this is one reason why R CMD check complains about
> S3 methods that
> > don't match the call of the base method.]
> >
> > This is much of a problem in interactive use, but it does
> cause problems in
> > functions, like my gregmisc::overplot(), which use the
> standard idiom
> >
> > m <- match.call()
> > m[[1]] <- as.name('plot')
> > eval(m, parent.frame() )
>
> Not a standard idiom for a generic with a formula method, and
> I think you
> really should be dispatching to the method here.
>
The problem is that plot.formula is not exported, so I cannot dispatch
directly to it. (This is what I did previously).
-Greg
> [...]
>
> --
> Brian D. Ripley, [EMAIL PROTECTED]
> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
> University of Oxford, Tel: +44 1865 272861 (self)
> 1 South Parks Road, +44 1865 272866 (PA)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
>
> ______________________________________________
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>
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