[Rd] plot(x) in 2.7.0 (with y=NULL) proposed code correction

Sklyar, Oleg (MI London) osklyar at maninvestments.com
Tue Apr 22 19:37:40 CEST 2008

To Martin:

sorry, you are right, my fault. Your SVN fix for axisLocal seems to
solve the problems for numerics.
However, the problem remains for POSIXct:


(for me it plots time on y correctly, but labeling of index x axis and
xlab="Index" are wrong/missing). I would assume that there is therefore
a problem in the current plot.POSIXct function. 

In fact, if one simply sets: plot.POSIXct = plot.default the result IS
correct! This is probably because POSIXct is numeric internally and axis
handling is performed correctly by your fix, i.e. strictly there is no
need for plot.POSIXct. For plot.POSIXlt, one could simply convert x into
POSIXct and call the default.

I do not think there will be many more "standard R" examples because the
problem was about calling one of the Axis.* methods and those are
defined for POSIX and Date classes only.

To Duncan:

I would be happy if I could test it before, I have recently started at
the current position and even now cannot access the R SVN directly due
to the company's internet connection policy.

The above working correctly for POSIXct with plot.default and not
working with plot.POSIXct was exactly the reason, why for me it is
logical to define Axis.MyClass rather than plot.MyClass.

Dr Oleg Sklyar
Technology Group
Man Investments Ltd
+44 (0)20 7144 3803
osklyar at maninvestments.com 

> -----Original Message-----
> From: Martin Maechler [mailto:maechler at stat.math.ethz.ch] 
> Sent: 22 April 2008 17:55
> To: Sklyar, Oleg (MI London)
> Cc: R-devel at r-project.org
> Subject: Re: plot(x) in 2.7.0 (with y=NULL) proposed code correction
> >>>>> "OlegS" == Sklyar, Oleg \(MI London\) 
> <osklyar at maninvestments.com>
> >>>>>     on Tue, 22 Apr 2008 17:34:24 +0100 writes:
>     OlegS> Hi all:
>     OlegS> following the previous discussion, it looks like 
> plot(x) with y=NULL
>     OlegS> still does not work correctly. If one tries for 
> example plot(1:5) it
>     OlegS> works, but already for plot(runif(100)) it does not. 
> ??? Not for me, with my propsal
> {{maybe only in your too much modified version of R ??}
> I've committed my proposal, and am interested in feedback, 
> notably additional relevant examples.
> Martin
>     OlegS> I posted the proposed correction for plot.POSIXct and
>     OlegS> plot.POSIXlt before. Please voice your opinions
>     OlegS> whether the following fix for plot.default could be
>     OlegS> reasonable? I include the full function and the diff.
> (And both suffered from wraparounds)

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