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 Espa?ol de Oceanograf?a
> Centro Oceanogr?fico 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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