[R] lattice help

[Prof Brian D Ripley]

Two problems:

1) You have a version of xyplot in your workspace: see the message you
quoted.

2) Your R version is old, and may not match your version of lattice.


On Mon, 22 Apr 2002, Sundar Dorai-Raj wrote:

> I'm new to lattice and can't figure out what the problem is with the
> following example:
>
> #########################
> > library(lattice)
> Loading required package: grid
>
> Attaching package `lattice':
>
>
> 	The following object(s) are masked _by_ .GlobalEnv :
>
> 	 xyplot
>
>
> 	The following object(s) are masked from package:base :
>
> 	 levels
>
> > test.data <- data.frame(x=rnorm(100),
> +                         y=rnorm(100),
> +                         group=gl(5,20))
> > xyplot(y~x|group,data=test.data,
> +        panel=function(x,y,subscripts,df) {
> +          text(x,y,labels=as.character(df[subscripts,"group"]))
> +          abline(lm(y~x))
> +        },df=test.data)
> Error in unique(by) : Argument "by" is missing, with no default
> >
> #########################
>
> I get the same error when I try the examples from the `xyplot' help
> page:
>
> #########################
> > data(quakes)
> > xyplot(long ~ lat , data = quakes)
> Error in unique(by) : Argument "by" is missing, with no default
> >
> #########################
>
> What am I missing?
>
>
> > version
>          _
> platform i386-pc-mingw32
> arch     x86
> os       Win32
> system   x86, Win32
> status
> major    1
> minor    4.0
> year     2001
> month    12
> day      19
> language R
>
> Thanks,
>
> Sundar
>
> --
>
> Sundar Dorai-Raj, Ph.D.
> Statistical Methods Engineer
> PDF Solutions, Inc.
> (972) 889-3085 x216
> (214) 392-7619 cell
> sundard at pdf.com
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-- 
Brian D. Ripley,                  ripley at 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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