[R] Strange behaviour in plot and points?

[Liaw, Andy]

Your call to plot is equivalent to plot(data$dummy1, NULL), or
plot(data$dummy1), which plots data$dummy1 against the index.  That is the
expected behavior.  Look at the default arguments to plot.default.

Cheers,
Andy

> -----Original Message-----
> From: miguel bernal [mailto:miguel.bernal at ma.ieo.es]
> Sent: Tuesday, July 02, 2002 5:15 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Strange behaviour in plot and points?
> 
> 
> Hello R-users
> 
> I was puzzled by some strange results of an analysis and I 
> found out what is 
> for me a strange behaviour (I won't dare to say a bug) in 
> both plot and 
> points (and I suspect lines and other kind of lower level 
> plots). If you try 
> the following code:
> 
> > data<-data.frame(dummy1=c(1:10),dummy2=c(1:10))
> > plot(data$dummy1,data$dummy3)
> 
> A plot of the values of dummy1 against an index is produced, 
> even when dummy3 
> does not exist. Same happens with points. Also, the index is 
> used as the 
> x-axis, so specially when using points in a plot already 
> made, the results 
> can be missleading. 
> 
> Wouldn't it be better to just have an error message saying 
> dummy3 does not 
> exist? 
> 
> I assume this behaviour is not release, nor plattform 
> dependent, but just in 
> case, I am using R 1.5.0 on Mandrake 8.2 Linux.
> 
> Thanks for your comments
> 
> -- 
> Miguel Bernal
> 
> Instituto Español de Oceanografía
> Centro Oceanográfico de Malaga
> Puerto pesquero s/n 29640, Fuengirola.
> Malaga, Spain
> Tlf: (34) 952 471907; Fax: (34) 952 463808
> e-mail: miguel.bernal at ma.ieo.es
> http:\\www.ieo.es
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