R help - Apr 2004 - Plot.lme error

Dear All;

	Attempting to reproduce Figure 4.15 of MEMSS (p. 171) in R using

             plot(Wafer, outer = ~ Wafer)
yields an error:
> plot(Wafer, outer = ~ Wafer)
Error in order(na.last, decreasing, ...) : 
        Argument lengths differ

	The plot() produces the figure without problems for all versions of
Splus (4.5 to 6.2) on  Windows. Noticing that the plot() differs slightly
between R and Splus, I copied the function from Splus, renamed it myplot()
in R and ran but without luck;
> myplot(Wafer, outer = ~ Wafer)
Error in myplot(Wafer, outer = ~Wafer) : Covariate must be numeric.

Coercing the covariate into numeric, but...
> myplot(Wafer, outer = ~ Wafer)
Error in !outer : invalid argument type

	Any suggestions and work around for the problem? I found the problem
dated back to R.1.4.1

	TIA,

Richard

On Thursday 29 April 2004 15:45, Yang, Richard wrote:
> Dear All;
>
> 	Attempting to reproduce Figure 4.15 of MEMSS (p. 171) in R using
>
>              plot(Wafer, outer = ~ Wafer)
>
> yields an error:
> > plot(Wafer, outer = ~ Wafer)
>
> Error in order(na.last, decreasing, ...) :
>         Argument lengths differ
Something's going wrong, but I don't know what. 

plot(Wafer, displayLevel = 1, key = FALSE)

seems to reproduce the figure correctly. I don't think figuring out the 
problem is worth the effort at this point.

Deepayan