R help - Mar 2011 - lattice: drawing strips for single-panel plots

The strip argument to panel.xyplot seems to be ignored for single-panel 
plots.  Here is an example:

   data(Chem97, package = "mlmRev")
   myStrip <- function(...) { ltext(.5, .5, 'strip text') }
   densityplot(~ gcsescore, data = Chem97, strip=myStrip)

The figure is printed with no strip.  The strip.default documentation 
suggests that Deepayan intended this behavior.  Still, it would help to 
be able to use the strip argument for single-panel plots.  Is there a 
simple way to do this?

Thank you,
John

John G. Bullock-2 wrote:
> 
> The strip argument to panel.xyplot seems to be ignored for single-panel 
> plots.  Here is an example:
> 
>    data(Chem97, package = "mlmRev")
>    myStrip <- function(...) { ltext(.5, .5, 'strip text') }
>    densityplot(~ gcsescore, data = Chem97, strip=myStrip)
> 
> The figure is printed with no strip. 
> 
The workaround is to give it a one-level factor:

library(lattice)
data(Chem97, package = "mlmRev")
Chem97$what = as.factor("strip text")
densityplot(~ gcsescore|what, data = Chem97)


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>
>> The strip argument to panel.xyplot seems to be ignored for 
>> single-panel plots. 
> The workaround is to give it a one-level factor:
>
> library(lattice)
> data(Chem97, package = "mlmRev")
> Chem97$what = as.factor("strip text")
> densityplot(~ gcsescore|what, data = Chem97) 
Thank you.  That works.

John