From ripley@stats.ox.ac.uk  Thu Dec  2 07:30:07 1999
From: ripley@stats.ox.ac.uk (Prof Brian D Ripley)
Date: Thu, 2 Dec 1999 07:30:07 +0000 (GMT)
Subject: Error in plot.aov() (PR#356)
In-Reply-To: <199912020241.DAA15486@pubhealth.ku.dk>
Message-ID: <Pine.GSO.4.05.9912020714370.26396-100000@auk.stats>

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?

-- 
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

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Error in plot.aov() (PR#356)
Prof Brian D Ripley