From ripley@stats.ox.ac.uk  Fri Dec  3 07:16:42 1999
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Fri, 3 Dec 1999 08:16:42 +0100 (MET)
Subject: Error in plot.aov() (PR#356) (fwd)
Message-ID: <199912030716.IAA29071@pubhealth.ku.dk>

Confirmation from John Maindonald.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

---------- Forwarded message ----------
Date: Fri, 3 Dec 1999 15:13:42 +1100 (EST)
From: John Maindonald <john.maindonald@anu.edu.au>
To: ripley@stats.ox.ac.uk
Subject: Re: Error in plot.aov() (PR#356)

Brian, you wrote -

> On Thu, 2 Dec 1999 john.maindonald@anu.edu.au wrote:
> 
> > The error occurs following the third Hit <Return> below:
> > 
> > > y_rnorm(40)
> > > gp_factor(rep(1:4,c(10,10,10,10)))
> > > xx.aov_aov(y~gp)
> > > summary(xx.aov)
> >             Df Sum Sq Mean Sq F value Pr(>F)
> > gp           3   0.67    0.22    0.29   0.84
> > Residuals   36  28.30    0.79               
> > > coef(xx.aov)
> > (Intercept)         gp2         gp3         gp4 
> >    0.286147    0.260974   -0.081828    0.126678 
> > > plot(xx.aov)
> > Hit <Return> to see next plot: 
> > Hit <Return> to see next plot: 
> > Hit <Return> to see next plot: 
> > Error in as.name(ylab23) : invalid type/length (1/0) in vector allocation
> 
> Interesting. There is no plot.aov on my system: this is using plot.lm.  
> And I get no error.  It could be random, except this has nothing to do with
> the data, only the labelling.
> 
> The error message means that ylab23 in NULL. I don't see how that can
> happen with the system version of plot.lm.
> 
> My guess is masking. Do you have a local plot.lm?  Does this happen if
> you start R with --vanilla?

You are quite right.  I had an experimental version of plot.lm()
lying around.  I should have thought of that.

Regards
John Maindonald               email : john.maindonald@anu.edu.au        
Statistical Consulting Unit,  phone : (6249)3998        
c/o CMA, SMS,                 fax   : (6249)5549  
John Dedman Mathematical Sciences Building
Australian National University
Canberra ACT 0200
Australia


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Error in plot.aov() (PR#356) (fwd)
ripley@stats.ox.ac.uk