[R] xyplot: Combining 'subscripts' and 'allow.multiple=T'

[Sundar Dorai-Raj]

Søren Højsgaard said the following on 4/20/2007 3:57 AM:
> Dear all, Consider this plot
>  
> xyplot(Sepal.Length + Sepal.Width ~ Petal.Length | Species, 
>        data = iris, allow.multiple=T,  outer=F,
>        panel = function(x,y,...) { 
>             panel.xyplot(x,y,...)
>        } 
> ) 
> 
> I want to *add* some things to each panel and what I want to add involves using the data for each panel, so I try to take this subset of data out with subscripts:
>  
> xyplot(Sepal.Length + Sepal.Width ~ Petal.Length | Species, 
>        data = iris, allow.multiple=T, outer=F,  
>        panel = function(x,y,subscripts,...) { 
>             panel.xyplot(x,y,...)
>             subiris <- iris[subscripts,] # Something using this ...
>        } 
> ) 
>  
> and then I get 
> Error in NextMethod("[") : argument "subscripts" is missing, with no default
> 
> Does anyone know how to obtain this??
>  
> By the way: The doc on xyplot says:  "The value of subscripts becomes slightly more complicated when allow.multiple is in effect. Details can be found in the source code of the function latticeParseFormula.". Sure.
>  
> Best regards
> Søren
> 
> 	[[alternative HTML version deleted]]
> 
> 
> 
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Hi, Søren,

Since you add "subscripts" to your panel arguments, you now need to 
explicitly pass it on to panel.xyplot. Try:

  xyplot(Sepal.Length + Sepal.Width ~ Petal.Length | Species,
        data = iris, allow.multiple=T, outer=F,
        panel = function(x,y,subscripts,...) {
             panel.xyplot(x,y,subscripts=subscripts,...)
             subiris <- iris[subscripts,] # Something using this ...
})

HTH,

--sundar