[Rd] Lattice: panel.superpose with ordered factor groups (PR#974)

[john.maindonald@anu.edu.au]

#       r-bugs@r-project.org
The panel.superpose() function for xyplot() complains when 
the groups parameter is set to be an ordered factor.

> library(mass)
> data(cabbages)
> library(lattice)
> xyplot(HeadWt~VitC|Cult, panel=panel.superpose,
+   groups=Date, data=cabbages)
> cabbages$Date <- ordered(cabbages$Date)  # Make Date an ordered factor
> xyplot(HeadWt~VitC|Cult, panel=panel.superpose,
+   groups=Date, data=cabbages)
Warning messages: 
1: Incompatible methods ("Ops.ordered", "Ops.factor") for "==" 
2: Incompatible methods ("Ops.ordered", "Ops.factor") for "==" 
3: Incompatible methods ("Ops.ordered", "Ops.factor") for "==" 
4: Incompatible methods ("Ops.ordered", "Ops.factor") for "==" 
5: Incompatible methods ("Ops.ordered", "Ops.factor") for "==" 
6: Incompatible methods ("Ops.ordered", "Ops.factor") for "==" 

--please do not edit the information below--

Version:
 platform = i386-pc-mingw32
 arch = x86
 os = Win32
 system = x86, Win32
 status = 
 major = 1
 minor = 2.3
 year = 2001
 month = 04
 day = 26
 language = R

Windows ME 4.90 (build 3000)  

Search Path:
 .GlobalEnv, package:grid, package:lattice, package:mass, package:ctest, Autoloads, package:base
John Maindonald            email: john.maindonald@anu.edu.au        
phone : (6125)3998         fax   : (6125)5549 
Statistical Consulting Unit, Room 1194,
John Dedman Mathematical Sciences Building
(Centre for Mathematics & Its Applications.)

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